26 



ANTHONY McGILL ON 



Table I. — Results or Analysis of Pure Coffee. 



Note. — The first seven coSees in this table were obtained in the roasted berry, and ground by myself. The 

 remainder were furnished me in the ground state by the Department of Inland Revenue. The silica found so 

 largely in some of them is, no doubt, an adventitious impurity. 



As the mean result of -work upon three samples of commercial chicory, I find the 

 number 1.02821 as the density of the extract. 



It is easy from these two numbers to construct a table giving the theoretical densities 

 of mixtures of coffee and chicory in any given proportions. Thus the following num- 

 bers (Col. 4, Table II) are obtained. 



For comparison not strictly justifiable, however, the numbers from Column 11 of 

 Table III are also entered. The comparison is not justified, because the numbers in 

 Column 4 are those calculated for a difference of 10 per cent, of the dri/ substance, while 

 those in Column 5 correspond to differences of 10 per cent, of chicory, calculated upon the 

 imdried substance. The percentage of dry substance corresponding to this is given in 

 Columns 6 and t. 



