1 9 1 9] 



WOO— A MARA NTH US 



337 



of the total phosphorus is in the organic combination in the seed, 

 existing (perhaps) as phosphoprotein and nucleoprotein phos- 

 phorus. Both of these forms are insoluble in water, alcohol, ether, 

 and alcohol-watersolvents. The inorganic phosphorus is relatively 

 low, and the writer believes that the figures given for inorganic 

 phosphorus in table V are even too high, because the greater part of 

 the inorganic phosphorus was obtained from the insoluble fraction 

 F 3 (4). Moreover, there is no proof that the reagents used did 

 not break down some of the organic phosphorus. The lipin phos- 

 phorus is very low, varying from 0.014 per cent in A. blitoides to 

 0.019 m A. retroflexus, calculated on dry weight basis. It is in- 

 teresting to know that in all cases the different forms of phos- 

 phorus are relatively higher in A. retroflexus than the corresponding 

 forms in A . blitoides. 



TABLE VII 

 Different nitrogen compounds in seeds (percentage dry weight) 



Material 



Total N 



Nitrates NO., 



Amino N 



Lipin N 



Soluble proteins. . 

 Insoluble proteins . 

 Total proteins 



2.370 



0.205 



0.090 



0.033 



2.890 

 12.250 



14. 140 



TABLE VIII 



Ratio of different N to total N (percentage dry weight) 



Material 



Total insoluble N 



Total soluble N 



Total 



Nitrate N 



Lipin N 



Amino N 



Other soluble organic N 



00 



23 

 23 



97 

 4i 

 84 

 37 



Nitrogen compounds. — The distribution of nitrogen in the 

 different fractions of the seeds is about the same as that of phos- 

 phorus. The insoluble nitrogen comprised 80-83 per cent of 

 the total nitrogen (tables VII and VIII). The soluble fractions 



