280 



TOBACCO PRODUCTION IN THE UNITED STATES. 



The results of the foregoing processes of mechanical analysis were then computed in percentages on the ignited 

 soil, and are given in the following table : 



TABLE V. MECHANICAL ANALYSES OF TOBACCO SOILS. 

 [Computed in percentages on the ignited soil.] 



2. CHEMICAL ANALYSES. The chemical analyses of the " fine earth" embrace analyses of the extracts obtained 

 "by treating, first, the air-dried soil with cold hydrochloric acid ; second, with hot hydrochloric acid ; third, by treating 

 the residue insoluble in hot hydrochloric acid with sulphuric acid, and analyses of the residues insoluble in sulphuric 

 acid. The acid extracts were prepared according to the directions of Wolff (op. cit., p. 12 et. seq.), and the 

 analyses were made substantially according to the method of the author in question, with the exception of the 

 analyses of the residues insoluble in sulphuric acid, which were made by the usual method of silicate analyses 

 (fusion), the alkalies being determined by the method of Professor J. Lawrence Smith. 



The results of the analyses are given in the following table, in which the method of Wolff has been in so 

 far departed from that the horizontal columns of figures headed "soluble in hot hydrochloric acid", in lieu of 

 representing the total substances extracted from the air-dried soil by hot hydrochloric acid, represent the 

 constituents soluble in hot but insoluble in cold hydrochloric acid, while the horizontal columns headed " total " 

 and printed in heavy type represent the percentage composition of the air-dried soils irrespective of the degree of 

 solubility of the constituents. 



TABLK VI. CHEMICAL ANALYSES OF TOBACCO SOILS. 



