aramecium Aurelia, long duration of 
_. life of, 568; octuple increase of, 568. 
arsneps, sugar produced from, 605. 
articles, elementary, 490; magnitude of, 
555; of Ampére, 490. 
Pelouze on certain combinations of a 
new acid, 470. 
ersoz, on circular polarization, 591. 
htheir of Ctesias and the Geoponics, 214. 
ile, action of, on alkaline sulphurets, 428. 
, voltaic, chemical effects in, 513. 
,thermo-electric, hydro-electric, 526. 
ixii’s magneto-electric machine, 543. 
lants, cellular tissue of, 560; gradual 
origin of animalcules from, 562. 
, irritability of, 241; metamorpho- 
-sis of, 586; presence of infusorial eggs 
in, 572; circulation in sap of, 239; sen- 
sibility of, 240; structure and compo- 
. sition of, 236; sugar contained in the 
foliaceous parts of, 588. 
Plateau on the angles of vision, 576. 
Pohl, experiments of, 608. 
Plisl’s microscope, 571. 
Poisson, on the theory of heat, 122. 
Polarization, circular, application to ve- 
getation, 584; laws of, 600. 
Poles, vegetative, light and gravitation, 
240, 245, 251; animal, absorbing and 
exhaling, 251. 
eo cruicter, infusoria of, 401; formation 
of, 406. 
Poncélet, on hydraulic wheels, 506. 
Polygastrica, ovarium of, 566. 
Potash, nitrosulphate of, 475; nitroxides 
of, 470. 
/——, sulpho-carbonate of, experiments 
| on the, 437. 
'Potassium, chloride of, 273 ; experiments 
_ of Berzelius on, 273; spiroilide of, 
158 ; its composition, 158. 
‘Power of transmitting caloric not pro- 
|. portional, 26. 
Priestley, green matter of, 232, 236. 
Pyralis Vitana, caterpillar of, method of 
destroying, 211. 
Radiant heat, laws of, 124; reflection of, 
| 383; transmission of, 1. 
Ram, electro-magnetic, 538. 
Raseneisen, infusoria of, 402. 
Raspail on the Cerealia, 587. 
Refractibility of calorific rays, 55. 
Refraction, double, of cooled glass, 78. 
Ritter on alloys, and amalgams, 519. 
Rive, De la, on the chemico-electric ac- 
tion of zinc, 521. 
Rock crystal, optical properties of, 258; 
sonorous vibrations of, 255; primitive 
form of, 255. 
Rose, H. on a new combination of the an- 
INDEX. 
637 
hydrous sulphuric and sulphurous acids, 
443. 
Rotatoria, intestinal canal of, 561. 
Sap of plants, circulation of, 239. 
Savart on elasticity of bodies, 139, 255. 
Savary, experiments on the variation of 
magnetic needles, 546. 
Scale, chromatic, 120. 
Schaffrinsky, improvements of, on the mi- 
croscope, 581. 
Schiek, microscope of, 581. 
SchiJling’s experiments on thegermination 
of the seeds of fungi and mould, 556. 
Schulthess, on electro-magnetism, 534. 
Screens, polish of, 18; thickness of, 19; 
nature of, 15. 
Seebeck’s experiments on the maximum 
of heat in the solar spectrum, 37. 
Seeds, alge, distinct from monads, 566. 
Semi-opal, infusoria of, 410. 
Sensibility of plants, 240. 
Shields, siliceous, of Bacillaria, 401. 
Sky, morning tints of, 100. 
Slime, coagulation of, into organized be- 
ings, 560, 562. 
Soda, nitroxides of, 470. 
Sodium, chloride of, £74. 
Solar spectrum, maximum of heat in, 37. 
Solar and terrestrial heat, differences be- 
tween, 69. 
Solids, formation of, in animals, 246. 
Solution, aqueous, of chlorous acid, pro- 
perties of, 280. 
Soul and psychical life, 225, 252. 
Sound, experiments of Goureau on, 381; 
propagation of, 372. 
Sounds and colours, analogies between, 
114, 119. 
Sounds produced by insects, 277. 
Soubeiran, experiments of, 272. 
Spark, electric, occurrence of, 630; no 
criterion of electric power, 510. 
Spectrum, solar, colours of, phenomena 
in, 81; maximum of heat in, 87. 
of candle-light, 491; of spirit 
flame, 492. 
Spermatazoa, primitive origin of, 582; 
inoculation of, 583. 
Spirea ulmaria, essential oil of, 153. 
Spiral conductor, influence of, 540. 
Spirals, best construction of, 608, 624. 
, electromotive, combinations of, 
610. 
Spiroil, its properties, 154. 
Spiroilic acid, 160; its composition, 161. 
Spondyle of Aristotle, of Pliny, 191, 197. 
Stahl’s doctrine, that the soul forms its 
own body, 253. 
Starch, chemical and physiological history 
of, 591, 598. 
