153 



grains. 

 Of water of absorption - 19 



Of loose stones and gravel principally siliceous 53 

 Of undecompounded vegetable fibres - 14 



Of fine siliceous sand - 212 



Of minutely divided matter separated by agitation 



and filtration, and consisting of 



Carbonate of lime - 19 



Carbonate of magnesia 3 



Matter destructible by heat, principally 



vegetable - - 15 



Silica 21 



Alumina - - 13 



Oxide of iron - 5 



Soluble matter, principally common 

 salt and vegetable extract - 3 



Gypsum - 2 



81 



Amount of all the products 379 

 Loss ... 21 



The loss in this analysis is not more than usually 

 occurs, and it depends upon the impossibility of collec- 

 ting the whole quantities of the different precipitates ; 

 and upon the presence of more moisture than is ac 

 counted for in the water of absorption, and which is lost 

 in the different processes. 



When the experimenter is become acquainted 

 with the use of the different instruments, the proper- 

 ties of the reagents, and the relations between the ex- 

 ternal and chemical qualities of soils, he will seldom 

 find it necessary to perform, in any one case, all the 



x 



