638 iND 



Steam, iiiechuiiical force of, 349. 



Steel, violet colour of, its property, 1 10. 



StefFens, H., on carbon and hydrogen as 

 characteristics of the siliceous series, 

 and of vegetables; nitrogen and hydro- 

 gen, of the calcareous series, and of 

 the animal world, 232. 



Sturgeon's experiments, 504, 536. 



Streams, their origin from woody moun- 

 tains, 241. 



Sugar, conversion of dextrine into, 585; 

 curious property of, 592. 



, starch, 592; cane, 592; carrot, 



605; parsnep, 605; beet-root, 605. 

 -, grape, 592 ; optical phaenomenon 



of, 596. 



-, cane, analogy of with starch su- 



gar, 596; physical character of, 597. 

 Sul|)huric acid, theory on the formation 



of, 476. 

 Sulphurets, alkaline, action of the pile on, 



428. 



, metallic, crystallization of, 431. 



Sulphurous acid, volatility of, 444. 

 Tannin, action on animal matter, 595. 

 Ttenia, curious mode of propagation, 564. 

 Tabanus buvinus, notes produced by, 378. 

 Ten Eyck's electric experiments, 534. 

 Terrestrial atmosphere, altitude of, 394. 

 Terrestrial and solar heat, differences be- 

 tween, 69. 

 Thermoscopes, description of, 8. 

 Thermomultiplier, 9; Gourjon's, 70. 

 Thorax of insects, description of, 378. 

 Transmission of radiant heat, capacity of 



bodies for, 30. 

 Transmission,calorific,modificationsof,39. 

 Treviranus's method of forming infusoria, 



232. 

 Tripoli, 401 ; infusoria of, 408. 

 Tourmaline, optical phjenomena of, 59. 

 Twilight-Monad, vast increase of, 575. 

 Twin crystals, phaenomena of colours in, 



83. 



Undulatory theorv, objections to, 477. 



Unity, organic, 240, 252; Carus's notion 

 of its division into duality, 242. 



Vapour, violet, produced by iodine and 

 indigo, distinction between, 596. 



Vapours, theory of, 370. 



Varying colours, laws of, 102. 



Vegetable kingdom, influence of, upon the 

 earth, 241. 



Vegetables, dualism of, terrestrial and 

 aerial, 235 ; cellular formation of, 237; 

 metamorphosis of, 238 ; sensibility of 

 240; irritability of, 241, 252, 253. 



Vessels, formed by circulating fluids, 251. 



Vibrations of laminae of glass, &c. 139. 



Vine, insects injurious to, 167, 171. 



Voltaic action, formation of metallic ox- 

 ides by, 420. 



pile, chemical effects in, 513. 



apparatus, magnetic power pro- 

 duced by, 511. 



Walckenaer on insects of the vine, 167. 



Watkins's experiments on electricity, 536. 



Wiitt, discovery of, 506. 



\Vater-dr()[), formation of, 229. 



Wheel-animalcnles, intestinal canal of, 

 561; red-coloured eyes of, 561. 



Wheels, hydraulic, construction of, 506. 



Wiesenerz, formation of, 402. 



Wires, conducting power of, 311. 



Wood, analysis of, 143. 



World, infusorial, Milky Way of, 566. 



, microscopic, fixed stars of, 583. 



Worms, intestinal, Ehrenberg on, 557; 

 generatio jn-bnitiva of, 557; structure 

 of, 557; cyclical development of, 558; 

 occurrence of, 558; fecundity of, 558 



Wrede on the absorption of light, 477. 



Zamboni's electrical clock, 533. 



Zinc, apparatus for preparing it pure, 521 ; 

 crystals of the oxide of, 425. 



Zoophytes, generatio cequivoca of, 572. 



Zymom, origination of the lowest forms 

 from, 570; formed by silica, 571. 



END OF THE FIRST VOLUME. 





raiNTED BY RICHARD AND JOHN E. TAYLOR, RED LION COURT, FLKET STREET. 



