INDEX. 365 



w. 



Water, one of the fluids diffused through the atmosphere, 1. — Its va- 

 riations and effects, as modified by temperature, 7. — Its passage into 

 the state of ice, 21. — Its action upon vegetables, 33. — Its absorp- 

 tion by soils, 34. — Concurs in germination, 77, 78. — Its influence 

 upon the nutrition of plants, 89. — Properties of different waters, 

 89, 90, 91. — Serves as a vehicle to the air, 92. — Hastens the fer- 

 mentation of manures, 116. — Its different states in the plant, 201. 



— Different qualities of well-water, 271. — Cistern- water, 272. — 

 Water of pools, ibid. — Filtration of water, 273. 



Wax, exists in some plants, 141. — Its extraction, i5i<i. — Its use in 

 the arts, ibid. 



Wo AD, 294, 295. — Extraction of indigo from woad ; variation in the 

 coloring principle, 297. — Gathering of the leaves, 298. — Manufac 

 ture of the cakes, 300 et seq. — Refining, ibid. — Dying of stuffs 

 301. — Means of improving the process of extracting the indigo, 303 



— Establishments at Albi, 303. — Difference in the indigoes obtained 

 304. — Process, ibid, et seq. — Of beating, 307. — Of precipitation 

 ibid. — Of washing, 309. — Drying, 311. — Sweating, ibid. — Esti 

 mates of the product, 312 et seq. — Encouragement desirable, 314. 



Wool, refuse, employed as a manure, CO et seq. 

 Workshops, which should be united to an establishment for special 

 instruction, 232. 



m^ 



