296 



TABLES. 

 TABLE 'S..—\_C(mtirmed. 



t Present.— 1 Possibly present.— (1) Mn, traces to 17 ; averaj^e 0.8. SiOg and 

 insoluble silicates 240—930; average 770.— (2) Fe203, usually traces. Sand and 

 insoluble silicates 29—178 ; average 48. Soluble \\Or, in older and foreign phos- 

 phates, 120; in recent American, aS. Chlorine, usually 0.— (.3) ITippuric acid, 

 1.8—60. Urea, 18—70; average 28.— (4) Urea. 23—33; average 29. Uric acid. 

 0.5-1.1; average 1.— (.5) Mn. 0—0.003.— (6) AljOg, NH3, FeaOg, PoO„ and N,0, 

 usually 0. MgO, K^O, NaaO, SO3, CO2, and CI, rarely 0. Organic matter 0-0.07 ; 

 average 0.03. 



