206 



BOTANICAL GAZETTE 



[SEPTEMBER 



Table V gives the percentage of ash of the soluble and insoluble 

 fractions. No marked difference appears between the two tissues. 



Table VI shows the amount of ether soluble substance and the 

 free fatty acid value. The figures in parentheses were not deter- 

 mined, but calculated on the assumption that the percentage of 



TABLE VI 

 Fats 



cc. of 



N/10 

 NaOH to 

 neutralize 

 free fatty 

 acid in 

 1 gm. of 

 ether ex- 

 tract 



Untreated 

 tissue. . . 



Ethylene treat- 

 ed tissue . . . 



(13-63) 

 ".33 



(13-71) 

 13-1*3 



ether-extractives was the same in these samples as in others. One 

 thing is rather clear from the table, namely that less fat is present 

 in the treated tissue, a fact which agrees with the effects of acetylene 

 in oily seeds as studied by Grafe and Richter (9). The free acid 

 value is of particular interest on account of the claim of Iwanow 

 (13) that the free acid value is predetermined by the degree of 

 saturation of the fatty acids involved in the fat in question. How- 

 ever, the free acid value of the fats in the two tissues was not found 



