1- 



86 



BOTANICAL GAZETTE 



[FEBRUARY 



TABLE I 



^^ 



Growth of wheat plants in solutions of phenol, resorcin, and phloroglucin 



Solution 



Transpiration 

 grams 



Phenol 500 ppm. 



Phenol 250 ppm 



Phenol 100 ppm 



Phenol 50 ppm 



Resorcin 500 ppm 



Resorcin 250 ppm 



Resorcin 100 ppm 



Resorcin 50 ppm 



Phloroglucin 500 ppm 

 Phloroglucin 250 ppm 

 Phloroglucin 100 ppm 

 Phloroglucin 50 ppm 



Green weight 

 grams 



dead 



« • « • 



dead 



# * > • 



20.6 



0-93 



27.8 



0.64 



19.9 



0-S3 



23.8 



0.76 



26.4 



0.84 



41.0 



0.98 



15.0 



0-54 



16.7 



0.69 



22.9 



0.98 



31.0 



0.80 



lirait 



hydroxid, hence the greater toxicity of this compound is probably 

 not due to its acid properties, but is to be attributed to the proper- 

 ties of the phenyl group. The introduction of additional hydroxyl 

 groups into phenol appears to alter its toxicity variously, so far as it 



connection 



converted upon standing to purpurogallein, which is more toxic 

 accordmg to Tsjte and Hunkel, than pjTogaUoI. 



There seems to be no evidence, therefore, from our experiment: 

 that the toxicity of phenols to ^vheat i; 

 hydroxyl groups is increased. 



diminished 



DERIVATIVES OF SOME 



mav 



IS quite widely distributed amoag plants, especiaUy among members 



of the Ericaceae. 



small 



AURENT (»9o) found that arbutin seemed to be assimflated 



Klebs ('96; found that a 0.5 per cent 



ma 



trations of 1000 



lis in the first day. 

 ^eedlingSj concen- 

 nployed. At the 

 tts STOTnncr m the 



