144 
Journal of Agricultural Research 
Vol. I, No. a 
course of a season's growth, just as in other plants there are well-defined 
tendencies toward certain physical characteristics. 
This investigation, however, has hardly progressed far enough to yield 
any definite conclusions. In Table VII a comparison is made between 
Fig. i.—D iagram showing the percentage of alkaloids in thel eaves of individual belladonna plants 
at the Arlington Experimental Farm, Va., during the seasons of 1911 and 1912. 
the years 1911 and 1912 of the 59 plants grown at Arlington, showing 
the variation of alkaloidal content above and below the average for each 
of the years mentioned. Figure 1 shows graphically the seasonal com¬ 
parison. 
