838 SOIL. 



Silica 71.56 



i\luniina • 11.40 



Oxide of iron 5.62 



Lime 0.80 



Magnesia 1.22 



Alkaline chlorides 1.21 



Phosphoric acid a trace. 



Loss 1.24 



100.00 



Bergman gives the following as the composition of a fertDe soil v 



Sweden : 



Carbonate of lime 30 



Gravel 30i 



Silicious sand 26 v Clay 



Alumina 14j 



100.0 



Several fertile soils of Senegal, examined by M. Laugier, con- 

 ained : 



K.awei. 



Silicious sand and silica 87.0 



Alumina 3.6 



Oxide of iron 3.4 



Carbonate of lime trace 



Orga ni c matter and water 4.4 



Loss 1.6 



100.0 100.0 100.0 100.0 I00.0 



M. Plagne, who has studied the agriculture of the Coromandel 

 coast, divides the soils he met with there into argillaceous, or clayey, 

 sandy, and mixed, and gives their several compositions as follows : 



Ar^illaceoui. Sandy. Mixed. 



Silica 22.0 82.0 64.0 



Alumina 59.0 6.5 19.5 



Carbonate of lime 3.5 3.5 2.5 



Oxide of iron 2.5 4.0 iA 



Phosphate of magnesia " ) an t«oo 



Sulphate of lime "S ^^ 



Azotized organic matter 5.0 " 7.0 



Water and loss 8.0 2.0 3.0 



100.0 100.0 100.0 



The soils in which the tea-plant is grown in Assam and China, 

 have been examined by Mr. Piddington ;* they contain respectively : 



Chinese soil. Assam soil. 



Silica and sand 76.0 84.8 



Alumina 9,0 4.5 



Oxideoflron 9.9 7.0 



Phosphate and sulphate of lime 1 .0 traces 



Organic matter 1.0 1.5 



Water • 3^ 2.3 



99.9 100.1 



Sir Humphrey Davy found the various soils most generally culti- 

 fated in England, to have the following composition : 



• Roi>iaiKMi, .\ccouat of A.vsam, p. 130. 



