INDEX. 319 



Vittarieae, characters of the group, i. 356 



Volatility of a compound, law of, i. 22 



Voltaic battery, i. 31 



Voltaic electricity. See Electricity 



Volvocineae, structure and reproduction of, i. 187, 189 



Volvox globator. structure and development of, i. 189 



Vorticella nebulifera, diversity of their reproductive powers, ii. 75, 76 



Vorticellse, structure of the, ii. 76 



food of, and mode of taking it, ii. 76, 77 



mode of reproduction of, ii. 77 

 Vulpinic acid, whence obtained, i. 303 



W 



Walking fern, structure and mode of reproduction of, i. 352. 

 Walnut, cause of blistered leaves of the, i. 291 

 Wasp, a West Indian, killed by fungi, i. 293, 294 

 Water almost impervious to heat, i. 36 



proportions of oxygen and hydrogen in, i. 94 



combination and decomposition of, i. 94 



force of the chemical combination requisite to form a gallon of, 

 from the combustion of the two gases, i. 97, 98 



force required to freeze water, i. 98 



amount of voltaic electricity required to separate a given quantity 

 of water into hydrogen and oxygen, i. 101 



the most common radicle in the inorganic and organic world, i. 107 



the water of crystallization, and the effect of heat upon it, i. 108 



production of aqueous solutions of organic and inorganic matter, i. 1 1 1 



water secreted night and morning by plants, i. 429 

 Water-flea, arborescent, structure of the, ii. 208 

 Waterproofing, India rubber prepared for, i. 120 

 Wax, vegetable, formation of, i. 422, 423 



functions of, i. 423 

 Wheat, probable causes of the rust and smut of, i. 281 



Cordiceps on the ergot of, i. 293 

 Whelks, tongues of, ii. 239, 240 

 Wood-louse, or slater, structure of, ii. 202 

 Wood of trees, fibro-vascular bundles constituting the wood of, i. 1 73, 1 74 



structure of, i. 408 

 Woodsia, structure of, i. 349 

 Woodsia ilvensis, structure and fructification of, i. 350 



