8o 



BOTANICAL GAZETTE 



[FEBRUARY 



toxicity may be due to the fact that neurin contains the vinyl group. 

 LoEw ('93) has pomted out that vinylamin (H,C = CH-XHJ is 



NH 



Substances 



containing the vinyl group possess the power of forming addition 



compounds. 



of wheat seedlings. 



1000 



Injury was caused, however, by solutions con- 



FlG. 2 



taming 1000 and 500 ppm. As shown by fig. 2, the injurious effect 

 was most marked upon the roots of the wheat plants. The weakest 

 concentration (i ppm.) caused a slight increase in growth, which 



:imulation 

 contrast to the 



highly 



was even slightly beneficiaL The 



1000 



grew 



