36 



BOTANICAL GAZETTE 



[JULY 



done in the case of the dihydroxy stearic acid experiment. This 

 is accomplished by taking the cultures contained in the smaller 



i 



triangles formed at each angle of the larger one shown in fig. 

 that is, the cultures contained within the triangles i, 16, 21; 21, 

 61 , 66; and 16, 56, 61, respectively. The sum of the green weights 

 in these respective triangles is shown in fig. 2 for the normal and 

 the cumarin sets, together with the relative growth. The phosphate 



P 2 



5 



CUAtA/?/A/ 



/EfZ>* T/tS£- G/?OWTH 



/VO /?***£. =r 43.3 \ 

 CUMtAWt/ = 36.S \ 



= 7.3 \ 





&9&¥TH 



KoO 



Fig. 2.— Showing the relative growth of normal and cumarin cultures in solutions 



high in phosphate, nitrate, or potash, respectively. 



end shows that the growth in the cumarin 



showed 



:h only 83 per cent of the normal. 



second set of experiments with cumarin was made 



conducted as in the first experiment. This grew from 



January 1 2 to January 

 The cumarin-affecti 



plants showed the same characteristic 

 n the former experiment, and, moreover, 



