_Badoin_, Mr. letters from, i. 314, 324.
_Ballads_, two, written by Franklin in his youth, i. 16.
_Balls_ of fire in the air, remark concerning, ii. 337.
_Barometer_, how acted on by air, ii. 92.
_Barrels_ for gunpowder, new sort proposed, i. 376.
_Bass_, unnecessary in some tunes, ii. 343.
_Bathing_ relieves thirst, ii. 104.
observations on, 211.
_Battery_, electrical, its construction, i. 193.
_Baxter_, Mr. observations on his enquiry into the nature of the soul,
ii. 110.
_Beccaria_, character of his book on electricity, i. 310.
_Beer_, not conducive to bodily strength, i. 62.
_Bells_, form in consecrating them at Paris, i. 384.
_Belly-ache_, dry, lead a cause of, ii. 220.
_Bermuda_, little thunder there, i. 216.
_Bermudian_ sloops, advantages of their construction, ii. 173.
_Bernoulli_, Mr. his plan for moving boats, ii. 179.
_Bevis_, Dr. draws electricity from the clouds, i. 429.
_Bible_, anecdote of its concealment in the reign of Mary, i. 7.
travestied by Dr. Brown, 31.
_Bills_ of mortality, reasonings, formed on those for capital cities,
not applicable to the country, ii. 383.
_Birth_, noble, no qualification in America, iii. 400.
_Bishops_, none in America, and why, ii. 456, 458.
_Black clothes_ heat more and dry sooner than white, ii. 108.
not fit for hot climates, 109.
_Blacksmith_, trade of, hereditary in Franklin's family, i. 4.
_Blindness_ occasioned both by lightning and electricity, i. 228.
_Boats_, difference of their sailing in shoal and deep water, ii. 160.
management of, best understood by savages, 176.
how rowed by the Chinese, 177.
methods of moving them by machinery, _ibid._
improvement of Mr. Bernoulli's plan for moving them, 179.
proposal for a new mode of moving them, _ibid._
double, advantage of, 173, 174.
one built by Sir W. Petty, _ibid._
_Bodies_, electrified negatively, repel each other, ii. 294.
effect of blunt, compared with pointed ones, i. 172, 223.
_Body_, human, specifically lighter than water, ii. 208.
political and human, compared, iii. 115.
_Boerhaave_, his opinion of the propagation of heat, ii. 58.
of steam from fermenting liquors, 59.
_Boiling_ water, experiments with, i. 332, 344, 345.
pot, bottom of, why cold, 387.
_Bolton_, Mr. experiment by, i. 346.
_Books_ read by Franklin in his youth, i. 15, 18, 20, 21.
_Boston_, the birth-place of Franklin, i. 8.
why quitted by him in his youth, 27,
its inhabitants decrease, ii. 210.
preface to proceedings of the town meeting of, iii. 317.
_Boyle's_ lectures, effect of, on Franklin, i. 79.
_Braddock_, general, defeat of, i. 131.
_Bradford_, printer at Philadelphia, i. 34, 102.
_Brass_, hot, yields unwholesome steams, ii. 249
_Brientnal_, Joseph, a member of the Junto club, i. 83.
_Brimstone_, when fluid, will conduct electricity, i. 256.
_Bristol waters_, an alledged fact concerning, ii. 95.
_Britain_, incapacity of, to supply the colonies with manufactures,
ii. 386.
_British empire_, an union of several states, iii. 310.
_Brown_, Dr. acquaintance of Franklin's, i. 30.
travestied the bible, 31.
_Bubbles_ on the surface of water, hypothesis respecting, ii. 48.
_Buchan_, earl of, letter to, on the price of land for new settlements
in America, iii. 409.
_Buildings_, what kind safest from lightning, i. 379.
_Bullion_, causes of its variation in price, iii. 153.
_Bunyan's_ Voyages, a book early read by Franklin, i. 15, 28.
_Bur_, cause of, round a hole struck through pasteboard, i. 280.
_Burnet_, governor, his attention to Franklin in his youth, i. 44.
_Busy-body_, essays under the title of, i. 86. iii. 422.