634 ixD 



tungi, cyclical cleveiopment of, 557 ; ex- 

 perimeiUs of Ehrenberg on, 555 ; ger- 

 mination of the seeds of, 556. 

 Gaillonclla distans, occurrence of, 40!!. 



• ■ ferruginea, Aeicr\\iUon of, 402. 



Galvanic battery. Ohm's theory on, 312. 



Galvanic chain. Ohm's, 511. 



Gas, chlorous acid, properties of, 293. 



, iodic, spectrum of light of, 478. 



, propagation of sound in, 372. 



Gases, action of,494 ; aggregate condition 



of, 490; evaporation and secretion of, 



250 ; law of the diflusion of, 394. 



Gaza, the locust of Amos and Joel, 200. 



Generatio ceqidvoca, critical examination 



of, 555. 

 Geology, relation of infusoria to, 568. 

 Glass, green, physical properties of, 335. 

 — — , its optical action when heating and 

 cooling, 85. 



, cooled, double refraction of, 78. 



, laminae of, vibrations of, 139. 



Glass molecules, absorptive force of, 44. 

 Glasses, achromatic object, Selligue's 



method of combining, 580. 

 Goethe on metamorphoses of plants, 238. 

 Gold, conductibility of, 322. 



dust, powerful reflection of, 579 ; 



transparency of, 579. 



leaf, thickness of, 572. 



Gourjon's thermomultipliers, description 



of, 70. 

 Gourean's experiments on sound, 381. 

 Graminea^, analysis of vegetation of, 584. 

 Grape-sugar, optical phaenomeiion of, 596. 

 Green glass, physical characters of, 335. 

 Greenhouse Coccus, description of, 215. 

 Gruithuisen, his views on infusoria, 232, 

 on the formation of orga- 

 nisms, 571. 

 Gryllo-Talpa, devastation of, 199. 

 Gum, property of, 587. 

 Gyrotrope, action of, 534. 

 Hare, calorimotor of, 515. 

 Harpsichord, ocular, Caslet's, 1 14. 

 Hauy on the refractions of light, 372. 

 Heat and light, identity of. 37; identity 



of the agents producing them, 388. 

 Heat at the surface of a body, movement 



of, 127. 

 Heat, differences between solar and ter- 

 restrial, 69 ; influence of, 598; mathe- 

 matical theory of, 122; maximum of 

 in the solar spectrum, 37 ; method of 

 measuring, 5; velocity of its propaga- 

 tion, 7 ; molecular vibration of, 389; 

 motive power of, 548; polarization of, 

 325; propagation of, 24, 389; refran- 

 gibility of, 392. 

 ' , radiant, concentration of, 387 ; 



laws of, 124 ; motion of, 125; distribu- 

 tion of, 128, 131; reflection of, 383j 

 transmission of, 1. 



Heat, solar, theory on, 137. 



Heavens, mechanism of, 451. 



Henry, experiments on electricity, 534. 



— , on the influence of a spiral con- 

 ductor, 540. 



Hoiiey, the two principles of, 605. 



Hoffinann, microscope of, 560. 



Hornschuch's views respecting the prima 

 germina rerum, 571. 



Human egg, development of, 247. 



Hydotina senta, duration of life of, 567. 



Hydrate of lime, properties of, 270. 



Hydraulic wheels, construction of, 506. 



Hydrochloric acid, mode of ascertaining 

 the presence of, 441. 



Hydrogen, action of, 426. 



Hydrospiroilic acid, composition of, 155. 



Hygroc7-ocii, uchracea, 402. 



Hy|)ochlorites, properties of, 305; pre- 

 paration of, 305. 



Identity of the agents producing light and 

 heat, theory of, 388. 



Indigo, its property of producing violet 

 vapour, 596. 



Induction, electro-dynamic, theory on,528. 



, dynamical, 54 5. 



Infusoria, according to Koelle living glo- 

 bules of Zymom, 570. 



Infusoria, coloured pouches of, 563 ; or- 

 gans of nutrition, 563; generative or- 

 gans of, 563; teeth of, 563; consum- 

 ption of, 406; occurrence of, 402; Eh- 

 renberg's observations on, 559; gene- 

 ratio cequivoca of, 559; formation of, 

 232 ; structure of, 560 ; fourfold mode 

 of reproduction of, 564, 567 ; ventral 

 cells of, 564 ; geographical diffusion of, 

 5?>5 ; man dependent on the will of, 

 565; origin from eggs of, 566; high 

 organization of, 561 ; cyclical develop- 

 ment of, 561 ; nervous system of, 566 ; 

 internal organs of, 567 ; division into 

 classes, &c., 567; fertility of, 567; oc- 

 tuple increase of, 568; influence of on 

 organic substances, 568 ; how precipi- 

 tated, 568; relation of to geology, 568; 

 development of into other difl^erent 

 bodies, 571 ; formed of Zynioni, 571 ; 

 certain forms of, produced by certain 

 infusions, 572 ; presence of infusorial 

 eggs in plants, 572. 



, the larger animals considered as 



formed of a mass of them, 246. 



, fossil, occurrence of, 400. 



Ingenhousz, on the green matter, 232. 

 Insect?, Walckenaer on, 167; names of, 

 and ill ancient writers, 171. 



