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	Title:	Subject:	Description:

41.	Letter to Lord Kaines, 28 February 1768 : on chimnies &c. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Chimneys -- Design and construction -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes from London to Lord Kaines in Scotland concerning the reasons the chimneys in the latter's new house might be drawing smoke from outside down the flue. Franklin says that poor...

42.	Letter to M. Landriani, 14 October 1787 : on the utility of lightning conductors. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Lightning rods -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes from Philadelphia to describe the success of lightning rod use in the city. His own home was among those saved from lightning damage through the use of lightning rods.

43.	Letter to Messrs. Dubourg and D'Alibard : on the mode of rendering meat tender by electricity. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Electric shock -- Physiological effect. Electricity -- Early works to 1800. Electricity -- Experiments -- History -- 18th century. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin responds to an inquiry about the possibility of using electricity to tenderize meat with his speculations about the possibilities. He cautions that animals killed by lightning are known...

44.	Letter to Mons. Alphonse Le Roy, August 1785 : on improvements in navigation. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Sailing ships. Naval architecture. Marine accidents. Gulf Stream -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin, writing at sea, describes many of his thoughts late in life on a variety of subjects related to the improvement of navigation. He writes about possible improvements in the design of...

45.	Letter to Mons. Dubourg : answer to some inquiries resepcting the art of swimming. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Swimming -- Early works to 1800. Swimming -- Health aspects. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes about various aspects of swimming. Among these are his having fashioned and used a kind of swim fin as a youth; various health benefits of swimming; the dangers of swimming in...

46.	Letter to Mons. Dubourg : on the nature of sea-coal. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Coal. Coal mines and mining -- England. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin tender the opinion that "sea-coal has a vegetable origin, and that it has been formed near the surface of the earth." He describes a visit to a coal mine at Whitehaven near Cumberland,...

47.	Letter to Mons. Dubourg, 28 July 1768 : on the free use of air. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Smallpox -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes from London to Monsieur Dubourg in reply to the latter's remarks about a new method of treating smallpox. Franklin does not like the cold water bath which was then in vogue. He...

48.	Letter to Mons. Vicq D'Azyr, 20 July 1781 : on the long retention of infection in dead bodies after sepulture &c. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Dead. Communicable diseases. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin relates several anecdotes about people having fallen ill after being exposed to long-dead bodies, including an Egyptian mummy. He speculates on the possibility of disease contagion surviving...

49.	Letter to Monsieur Dubourg, 1 June 1773 : on the choice of glass for the Leyden experiment. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Glass -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes about problems with glass used for the Leyden jar experiment into the nature and properties of electricity. He offers conjectures about various imperfections in the glass that...

50.	Letter to Monsieur Dubourg, 10 March 1773 : on the analogy between magnetism and electricity. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Magnetism -- Early works to 1800. Magnetism -- Experiments. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes about "the magnetism which seems produced by electricity" stating that his "real opinion is, that these two powers of nature have no affinity whatever with each other, and that...

51.	Letter to Monsieur Dubourg, 8 December 1772 : answer to some queries of Monsieur Dubourg respecting the armonica. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Glass harmonica. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin explains the arrangement of the glasses in the "armonica," and explains how to play the instrument. He concludes that "nothing but experience can instruct with respect to this manipulation...

52.	Letter to Monsiuer Dubourg : on the death of persons struck by lightning. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Life (Biology) -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin uses a reference to persons killed by lightning as a springboard to speculate about "the doctrines of life and death, in general." He writes about toads remaining buried alive in sand...

53.	Letter to Mr. Croghan, 5 August 1767 : conjecture as to elephants being native to America. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Elephants -- Early works to 1800. Elephants -- United States. Elephants, Fossil. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes about his reactions to elephant tusks and teeth sent to him for examination. Includes his puzzlement over some characteristics of the teeth. Concludes that finding elephant fossils...

54.	Letter to Mr. Edward Nairn, 18 October 1783 : on his patent electrical machine, and the effects of lightning on the eyes &c. of animals killed by it. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Electricity -- Early works to 1800. Hygrometers -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes to comment on a machine sent to him with an accompanying pamphlet about electrical experiments. He responds to Nairn's letter with a brief anecdote about the effect of lightning...

55.	Letter to Mr. Humphry, 14 February 1773 : on the spots in the sun, a new hypothesis. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Sunspots -- Early works to 1800. Franklin, Benjamin, 1706-1790 -- Correspondence.	Writing from London, Benjamin Franklin acknowledges receipt of some seeds from Humphry, as well as the latter's observations on sunspots. Franklin relates how he has circulated Humphry's notes to members...

56.	Letter to Mr. Rittenhause, 15 December 1783 : on the comet seen in Yorkshire, 1783. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Comets -- 1783. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin, writing from France, passes on a reported sighting of a comet in England to a friend in America. Letter includes data on the comet's position.

57.	Letter to Mr. Winthorp, 2 July 1768 : on astronomical subjects, electricity &c. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Astronomical instruments -- Early works to 1800. Lightning. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes from London to Mr. Winthorp about a series of astronomical instruments the latter had ordered made for himself. Various delays in the manufacture and delivery are explained. Franklin...

58.	Letter to Mr. Winthrop, 25 July 1773 : on lightning conductors. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.	Lightning rods. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes from London describing in French and English the growing use of lightning rods.

59.	Letter to Peter Collinson, 18 April 1754 : on electrical charges in clouds. From: The complete works of Benjamin Franklin; including his private as well as his official and scientific correspondence, and numerous letters and documents now for the first time printed, with many others not included in any former collection, also, the unmutilated and correct version of his autobiography. Comp. and ed. by John Bigelow. New York and London, G. P. Putnam's sons, 1887-88.	Electricity -- Early works to 1800. Electricity -- Experiments -- History -- 18th century. Franklin, Benjamin, 1706-1790 -- Knowledge -- Physics. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin describes two experiments to determine whether an electrical charge is positive or negative. He also describes the observations of a Mr. Kinnersley regarding the electrical charge in...

60.	Letter to Robert Hunter Morris, Governor of Pennsylvania, 26 January 1756 : on troop disposition near Bethlehem. From: The complete works of Benjamin Franklin; including his private as well as his official and scientific correspondence, and numerous letters and documents now for the first time printed, with many others not included in any former collection, also, the unmutilated and correct version of his autobiography. Comp. and ed. by John Bigelow. New York and London, G. P. Putnam's sons, 1887-88.	United States -- History -- French and Indian War, 1755-1763. Franklin, Benjamin, 1706-1790 -- Correspondence.	Benjamin Franklin writes about the movement of colonial troops from Bethlehem and Nazareth, Pennsylvania into the neighboring mountains for the construction and garrisoning of forts.

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