366 
INDEX. 
Engines, Thermo-dynamic, theory of, 137. 
Equations, differential, occurring in dynamical problems, 71 ; examples of, 96. On the equations 
of rotatory motion, 105. 
Excrements, organic chemical constituents of, in Man and animals, 265 ; excretine, a constituent 
of, 267 ; effects of alimentation on, 268 ; margaric acid in, 272 ; colouring matter in, 273 ; 
excretoleic acid in, 275; of carnivorous animals, 276; of herbivorous animals, 279; of 
granivorous animals, 281 ; differences in, 282. 
Excretine, a constituent of human faeces, 267 ; sulphur contained in, 267-270 ; probable forma- 
tion, 268 ; not a constituent of animal feces, 282. 
Excretoleic acid, 275. 
F. 
Fluids in motion, thermal effects of, 321. 
G. 
Graham (Thomas). On Osmotic Force, 177. 
H. 
Hassall (A. H.). On the frequent occurrence of Indigo in Human Urine, and on its Chemical, 
Physiological, and Pathological Relations, 297. 
Heat, geometrical representation of expansive action of, 115; isothermal curves, and curves of no 
transmission of, 116; mechanical equivalent of, 119-143; general equation of expansive 
action, 123 ; curves of free expansion, 130 ; relation between temperature and actual heat, 147. 
Heat, mechanical action of, thermometric scale founded on, 350. 
Hooker (J. D.). On the Functions and Structure of the Rostellum of Listera ovata, 259. 
I. 
Indigo, in urine, 297 ; its relation with haematin and urine-pigment, 305 ; an elimination of 
carbon from the system, 307. 
J. 
Joule (J. P.) and Thomson (W.). On the Thermal Effects of Fluids in Motion, 321 ; variations 
in cooling effect, 322 ; causes of fluctuation of temperature, 323 ; experiments in tubes plugged 
with cotton wool, 325 ; with plug of silk, 327 ; cooling effects on carbonic acid, 329 ; on 
hydrogen, 334 ; influence of temperature on cooling effect, 335 ; relation between the heat 
evolved and work spent in compressing a gas, 337 ; density of saturated steam, 344; evalu- 
ation of Carnot’s function, 348 ; absolute thermometric scale founded on the mechanical 
action of heat, 350 ; physical properties of air according to the absolute thermo-dynamic 
scale, 353 ; table of specific heats of air, 363. 
L. 
Lemniscates, on the rectification of, 61. 
Light, theory of vibrations of, 11; harmonic resonance of, 13; determinations of component and 
secondary waves of, 20 ; elucidation of optical laws, 33. 
Listera ovata, functions and structure of the rostellum of, 259. ■ 
