IND EX. 
Saturn's rings, on the theory of, 263, 
508. 
Sawitsch (M.) on acetylene, 358. 
Scheenbein (Prof.) on the insulation 
of antozone, 88. 
Scholz (M.) on a new sulphur com- 
pound, 125. 
Schroeder (M.) on fermentation and 
putrefaction, 361. 
Schiitzenberger (M.) on a new class 
of salts, 497. 
Seelheim (M.) on saligenine, 363. 
Siemens (C. Wm.) on a new resist- 
ance-thermometer, 73. 
(M. W.) on a standard measure 
of resistance to galvanic currents, 
25. 
Siphon-electrometer, on the, 452. 
Smithe (J. D.) on the gravel and 
boulders of the Punjab, 305. 
Soda-flame, on the opacity of the 
yellow, to light of its own colour, 
55. 
Spectrum, on the relations of the 
colours of the, 141. 
Staurotide, ou the formation of, 496. 
Steam, on the density of, at all tem- 
peratures, 230. 
Stewart (B.) on the nature of the 
light emitted by heated tourmaline, 
391. 
Stromeyer (M.) on the estimation of 
tin, 298 
Sucecinic acid, on derivatives of, 124. 
Swan (Prof. W.) on the temperature 
correction of siphon barometers, 
206. 
Syllogism, on the, 473. 
Sylvester (Prof.) on the numbers of 
Bernoulli and Euler, 127; on the 
historical origm of the unsymme- 
trical six-valued functions of six 
letters, 369; on a problem in tac- 
tic, 515. 
Tait (Prof.) on Ampére’s experiment, 
319. 
Tate (T.) on the laws of absorption 
of liquids by porous substances, 57, 
115; on the density of steam at 
all temperatures, and the law of ex- 
5 5 l 
pansion of superheated steam, 230 ; 
on certain peculiar forms of capil- 
lary attraction, 254; on certain 
laws relating to the boiling-points 
of different liquids, 331; on a new 
electrometer for measuring the 
electric charge of a machine, 452. 
Temperature correction of siphon 
barometers, on the, 206. 
Temperatures, on the production of 
low, 296. 
Thermometer, on a new resistance, 73. 
Thomsen (J.) on a constant copper- 
carbon battery, 80. 
Tin, on the separation of, 297. 
Tourmaline, on the nature of the 
light emitted by heated, 319. 
Tungsten and its alloys, researches 
on, 292. 
Vapour-densities, on a method of 
taking, 398. 
Vapours, on the refractive indices of, 
at high temperatures, 296. 
Vaughan (D.) on the stability of sa- 
teilites in small orbits, and the 
theory of Saturn’s rings, 263; on 
phenomena which may be traced 
to the presence of a medium per- 
vading space, 507. 
Vegetation, on the sources of the 
nitrogen of, 521. 
Venus, on the inequalities of long 
period due to the action of, 239. 
Violin, on the motion of the strings 
of a, 393. 
Wanklyn (J. A.) on a method of 
taking vapour-densities, 398. 
Water, on the freezing of, 543. 
Waterston (J. J.) on a law of liquid 
expansion, 401. 
Wertheim (M. G.) on the cubical 
compressibility of certain solid ho- 
mogeneous bodies, 44/7. 
Williams (C. G.) on isoprene an 
caoutchine, 463. 
Woods (Dr. J.) on Sainte-Claire De- 
ville’s theory of dissociation, 2U2. 
Yeast, on the permanent vitality of, 
123. 
Zircon, on the formation of, 496. 
END OF THE TWENTY-FIRST VOLUME. 
