''aiaincecium Aurelia, long duration of 

 life of, 568; octuple increase of, 568. 



'arsiieps, sugar produced from, 605. 



^articles, elementary, 490; magnitude of, 

 555; of Ampere, 490. 



^elouze on certain combinations of a 

 new acid, 470. 



'ersoz, on circular polarization, 591. 



'htlieirof Ctesias and the Geoponics, 214. 



•'ile,action of, on alkaline sulpluirets,428. 

 -, voltaic, chemical efiects in, 513. 

 -, thermo-electric, hydro-electric, 526. 



Pixii's magneto-electric machine, 543. 



Plants, 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. 



Plosl'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. 



Polirschiefer, infusoria of, 401 ; formation 

 of, 406. 



Poncelet, 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. 



Pi/raiis Vitana, caterpillar of, method of 

 destroying, 211. 



Radiant heat, laws of, 124; reflection of, 

 383 ; transmission of, 1. 



Ran), electro-magnetic, 538. 



Raseneisen, infusoria o\', 402. 



Raspail on the Cerealia, 587. 



Refractibility of calorific rays, SH. 



Refraction, double, of cooled glass, 78. 



Ritter on alloys, and anialj^anis, 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, II. on a new combination of thean- 



5X. 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. 



Schilling's experimentsonthegermination 

 of the seeds of fungi and mould, 556. 



Schultliess, 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, algae, 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, 24G. 



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, 377. 



Soubeiran, experiments of, 272. 



Spark, electric, occurrence of, 630; no 

 criterion of electric power, 510. 



Spectrum, solar, colours of, phaenomena 

 in, 81 ; maximum of heat in, 87. 



of candle-light, 491 ; of spirit 



flame, 492. 



Spermatazoa, primitive origin of, 582 ; 

 inoculation of, 583. 



SpircBa ulmaria, essential oil of, 153. 



Spiral conductor, influence of, 540. 



Spirals, best construction of, 608, 624. 



, electromotive, combinations of, 



610. 



Spiroil, its propertief , 1 54. 



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. 



