155 



fanning, -'8; loss by sjsteni of 

 farming, 34; maintaining, chap- 

 ter on, 25. 



Soil grains, surface area of, 19. 



Soils, biological condition of, 21 ; 

 cracking of, 19; inoculation of, 

 23 ; lumpy, 19 ; mechanical com- 

 position of, 18; plant food sup- 

 ply of, 14; puddling of, 19; phy- 

 sical condition of, 18; tempera- 

 ture of, 18; thawing and freez- 

 ing of, 19. 



Soot, loi. 



Straw as bedding, 36; absorptive 

 power of, n. 



Street sweepings, loi. 



Sulphate of potash, 91. 



Sulphur, 4. 



Sulphuric acid, 80; manufacture of, 

 80. 



Superphosphates, chapter on, 80 ; fav- 

 oritism for bone superphosphates, 

 86; how to make at home, 88; 

 manufacture of, 80; names ap- 

 plied to, 84 ; no free acid in, 87 ; 



the difference between phosphates 

 and superphosphates, 83; the dif- 

 ference of the forms of phos- 

 phoric acid in, 81, 82, 83, 85. 



Sylvinit, 91. 



Tankage, 53 ; grades of, 53 ; varia- 

 tion in, 53. 



Thomas phosphate powder, see basic 

 slag. 



Tobacco stems and stalks, 94. 



Trade values of fertilizers, 123 ; dis- 

 cussion of table of, 124; how 

 obtained, 124. 



Tubercles, 3. 



Unit system of purchase of fertiliz- 

 ers, 114. 



Valuation of fertilizers, chapter on, 

 119. 



\'alues, agricultural and commercial, 

 121, 122; trade, 123. 



Water in plants, 6, 7, 8. 



Wood ashes, 93 ; value of, 93. 



Wood waste, shoddies, etc., 62 ; 

 treated, 62. 



