70 



TEE BOTANICAL MAGAZINE. [Vol. xxxi. No. 363. 



Table I. 



time in minutes. 



intensity of colour (cone.). 



k 







100 







15 



72 



0.01956 



45 



42 



0.01927 



60 



32.6 



0.018695 



75 



27.5 



0.01738 



105 



21.3 



0.01472 



In like manner a slightly acidified authocyanin solution from 

 the leaves of Perilla osimoides var. crispa f. purpurea were sub- 

 jected to oxidation. 1 The result is as follows : 



Table II. 



time in minute. 



intensity of colour (cone.) 



k 







100 







32 



56.25 



0.018018 



43 



42.5 



0.019869 



65 



32.5 



0.017307 



75 



30.0 



0.016040 



85 



23.75 



0.016988 



95 



20.0 



0.016941 



105 



15.0 



0.018058 



115 



12.5 



0.018081 



The pressed juice of ArmiUaria edodes filtered through 

 muslin and diluted by water, is used as the oxidising agent 

 and anthocyanin from the flower of chrysanthemum is subjected 

 to oxidation. The result is given below (compare Fig. 2) : 



Table HI. 



time in minutes. 



intensity of colour (cone). 







100 



10 



69 



20 



33 



25 



28 



30 



27 



40 



23 



1 The initial colour was about as deep as 0.01 per cent safranin solution. 



