436 Minute Ingredients of Soil. 



•n 1 fiA i. Yer acre at Si 



Per 100 parts • i j ^u 



^- , -IS inches devth 



(ill decimals). ^, , ' , 



^ ^ throughout. 



Brought forward 96-443 4,822,150 



Protoxide and peroxide of iron ... 1 • 800 90,000 



Peroxide of manganese a trace 



Lime in combination with silica . . . 0*038 1,900 



Magnesia, ditto 0*006 300 



Potash and soda • 005 250 



Phosphate of iron O'lOS 9,900 



Sulphuric acid 0-002 100 



Chlorine 0*006 300 



Humus soluble in alkahes 1*000 50,000 



Ditto insoluble in ditto 0*502 25,100 



This may be read as 100 parts, or 100,000 lbs. 100*000 5,000,000 



By contrasting the large quantities of any ingredient contained 

 throughout the soil of each of two separate acres, the difference in the 

 composition of such soils appears to be much more strikingly displayed 

 than by merely comparing how many thousandth parts of a unit of any 

 ingredient are contained in one soil, and how many thousandth parts of 

 a unit of the same ingredient are contained in another. 



If this hint should be found useful to any parties who may wish to 

 examine into Liebig's analysis of soils, or should give some idea of the 

 large scale on which nature fertilises (I might say manures) land, I 

 shall be amply repaid for my trouble, and remain, 



Dear Sir, very respectfully yours, 

 John Hall. 



Specific Gravities. 



From To 



Chalk 2252 oz. 2657 oz. per cubic foot. 



Dolomite 2540 2830 



Felspar 2438 2700 



Flint 2582 2582 



Granite 2613 2956 



Gypsum 1872 2288 



Selenite 2311 3000 



Oxide of iron .... 3573 3573 



Magnesia (carbonate of) . 2220 2612 



Limestone 2386 3000 



Quartz 2624 3750 



Calcareous spar . . . 2837 2837 



Coal 1020 jg^QJas a representative 



( of humus. 



13)31,268 13)36,085 



Average . . . 2,405 oz. 2,776 oz. 



or 150 lbs. or 173 J lbs. per cubic foot. 



