_Sailing_, observations on, ii. 163.
_Sails_, proposed improvements in, ii. 164, 166.
_Saint_ Bride's church, stroke of lightning on, i. 374.
_Salt_, dry, will not conduct electricity, i. 258.
rock, conjectures as to its origin, ii. 91.
_Saltness_ of the sea-water considered, _ib._
_Savage_, John, a companion of Franklin's, i. 72.
_Savages_ of North America, remarks on, iii. 383, _et seq._
_School_, sketch of one, for Philadelphia, ii. 370.
_Scotch_ tunes, harmony of, and melody, ii. 338.
_Screaming_, a defect in modern tunes, ii. 345.
_Scull_, Nicholas, member of the Junto club, i. 83.
_Sea_, electrical qualities of its component parts, i. 205.
opinion, that it is the source of lightning, considered, 269, 321,
322.
supposed cause of its luminous appearance, ii. 88.
from what cause, salt, 91.
has formerly covered the mountains, _ib._
_Sea-coal_, has a vegetable origin, ii. 128.
prejudices against the use of, at Paris, 278.
_Sea-water_, soon loses its luminous quality, i. 269.
considerations on the distillation of, ii. 103.
how to quench thirst with, 104.
thermometrical observation on, 199, _et seq._
_Security_, a just ground to demand cessions from an enemy, iii. 93.
_Separation_ of the colonies from Britain, probability of, in 1775,
iii. 356.
_Servants_ in England, the most barren parts of the people, ii. 395.
_Settlements_, new, in America, letter concerning, iii. 409.
_Settlers_ of British colonies, their rights, iii. 299.
_Sheep_, a whole flock killed by lightning, i. 415.
_Ships_, abandoned at sea, often saved, ii. 169.
may be nicely balanced, 170.
accidents to, at sea, how guarded against, 172.
_Shirley_, governor, letters to, on the taxation of the colonies, iii. 30.
on American representation in the British parliament, 37.
_Shooting-stars_, letter on, ii. 36.
_Shop-keepers_ in America, iii. 394.
_Sides_ of vessels, the best construction of, ii. 172.
_Silver_ cann, experiment with, i. 307.
vessels, not so easily handled as glass, when filled with hot liquors,
ii. 57.
_Slavery_, society for the abolition of, i. 151.
address to the public on the abolition of, iii. 517.
_Slaves_, not profitable labourers, ii. 386.
diminish population, ii. 387.
_Slave-trade_, sentiment of a French moralist respecting, ii. 195.
parody on the arguments in favour of, 450.
_Sliding-plates_ for smoky chimnies described, ii. 287.
_Slitting-mills_ in America, iii. 270.
_Small_, Mr. Alexander, letter from, i. 374.
_Smell_ of electricity, how produced, i. 244.
_Smoke_, principle by which it ascends, ii. 257.
stove that consumes it, 296.
the burning of, useful in hot-houses, 316.
_Smoky_ chimnies, observation on the causes and cure of, ii. 256.
remedy for, if by want of air, 261, 262.
if by too large openings in the room, 266, 268.
if by too short a funnel, 269.
if by overpowering each other, 270, 271.
if by being overtopped, 271, 272.
if by improper situation of a door, 273.
if by smoke drawn down their funnels, 274, 275.
if by strong winds, 275, 276.
difficult sometimes to discover the cause of, 282.
_Smuggling_, reflections on, ii. 430.
encouragement of, not honest, 432.
_Snow_, singular instance of its giving electricity, i. 373.
_Soap-boiler_, part of Franklin's early life devoted to the business of,
i. 10, 14.
_Societies_, of which Franklin was president, i. 151.
learned, of which he was a member, 135.
_Socrates_, his mode of disputation, i. 21.
_Songs_, ancient, give more pleasure than modern, ii. 342.
modern, composed of all the defects of speech, 344.
_Soul_, argument against the annihilation of, iii. 548*.
_Sound_, best mediums for conveying, ii. 335.
observations on, 336.
queries concerning, 337.
_Sounds_ just past, we have a perfect idea of their pitch, ii. 340.
_Soup-dishes_ at sea, how to be made more convenient, ii. 195.
_Spain_, what has thinned its population, ii. 390.
_Specific_ weight, what, ii. 226.
_Spectacles_, double, advantages of, iii. 544*, 551*.
_Speech_, at Algiers, on slavery and piracy, ii. 450.
of Mr. Galloway, preface to, iii. 163.
last of Franklin, on the federal constitution, 416.
_Spelling_, a new mode of, recommended, ii. 359.
_Spheres_, electric, commodious ones, i. 178.
_Spider_, artificial, described, i. 177.
_Spirits_, fired without heating, i. 214, 245.
linen wetted with, cooling in inflammations, ii. 87.
should always be taken to sea in bottles, 175.
_Spots_ in the sun, how formed, i. 260.
_Squares_, magical square of, ii. 324.
_Staffordshire_ chimney, description of, ii. 285.
_Stamp-act_ in America stigmatized, iii. 228.
letter on the repeal of, iii. 239.
examination of Franklin on, 245.
_Stars._ See _Shooting_.
_State_, internal, of America, iii. 291.
_Storms_, causes of, ii. 65.
_Stove_, Dutch, its advantages and defects, ii. 233.
German, ditto, 234.
to draw downwards, by J. G. Leutmann, 298.
for burning pit-coal and consuming its smoke, 301, 304, 308.
_Strata_ of the earth, letter on, ii. 116.
_Strahan_, Mr. queries by, on American politics, iii. 287.
answer to the queries, 290.
letter to, disclaiming his friendship, iii. 354.
_Stuber_, Dr. continuator of Franklin's life, i. 98.
_Studies_ of trifles, should be moderate, ii. 95.
_Stuttering_, one of the affected beauties of modern tunes, ii. 245.
_Sugar_, cruelties exercised in producing it, ii. 196.
_Sulphur_ globe, its electricity different from that of the glass globe,
i. 265.
_Sun_, supplies vapour with fire, i. 207.
why not wasted by expense of light, 259.
effect of its rays on different coloured clothes, ii. 108.
light of, proposed to be used instead of candlelight, iii. 470, 473.
discovered to give light as soon as it rises, 471.
_Surfaces_ of glass, different state of its opposite ones, when
electrised, i. 191, 238.
_Swimming_, skill of Franklin in, i. 66.
art of, how to be acquired, ii. 206
how a person unacquainted with it may avoid sinking, 208.
a delightful and wholesome exercise, ii. 209, 211.
advantage of, to soldiers, 210.
inventions to improve it, _ibid._ 212.
medical effects of, _ibid._