140 
Journal of Agricultural Research 
Vol. II, No. a 
acid numbers, only little importance can be attached to the results. The 
saponification numbers, which represent the total saponifiable constit¬ 
uents, including both free acids and esters, should exhibit practically no 
deviation from the course of the ester numbers. Particular stress is 
therefore placed upon the ester number of the fractions, since these values 
represent a measurement of the chief odorous constituents of the oils. 
The acid, ester, and saponification numbers of the fractions from each 
individual oil of the seasons of 1906, 1907, 1908, and 1909 are shown in 
Table VII. Since particular attention is given to the ester numbers, 
curves were made of this chemical property of the fractions, as shown 
in figures 10, 11, 12, and 13. 
