1894.] Contributions to the Chemistry of Clilorophyll. 353 



to be recrystallised several times in order to get it into a state fit for 

 analysis. This process of purification, as -well as the subsequent 

 "determinations, were undertaken by Dr. L. Marchlewski, whose 

 (scrupulous care and manipulative skill afford a sufficient guarantee 

 for the accuracy of the results obtained. 



I think it unnecessary to give the details of analysis of more or 

 less pure specimens of the substance, but I may state that the crystals 

 when first prepared gave the following percentages of C, H, and N. 



C 70-27 



H 5-89 



N 9-89 



The substance, after being purified by dissolving it in chloroform, 

 adding a large quantity of alcohol, and collecting the crystals de- 

 posited on standing, the process being repeated three times, gave as 

 the result of two determinations 11'93 and 11"85 per cent, nitrogen. 

 'After three further crystallisations the percentage of nitrogen was 

 found to be 12'07 and 11'87. The four analyses agreeing so well as 

 regards the nitrogen it was assumed that the substance was pure, 

 and it only remained therefore to determine the C and H, the results 

 obtained being as follows : 



I. 0-1521 gram substance gave 0'3838 C0 2 and 0-0852 H 2 0. 

 II. 0-1877 0-4745 0'0998 



III. 0-1284 0-3246 0'0683 



In 100 parts 



I. II. III. 



C 68-71 68-82 68-94 



H 6-20 5-90 591 



Taking the mean of the numbers given the composition of methyl- 

 phyllotaonin would correspond to 



C 68-82 



H 6-00 



N 11-93 



13-25* 



Ethylphyllotaonin. 



In order to purify this substance the same method was adoptod as 

 in the case of methylphyllotaonin, i.e., it was dissolved in chloroform 



* Some time ago Mr. Percy C. Bell, working with a less pure specimen of 

 methylphyllotaonin, found it to contain in 100 parts 



C 68-87 



H . 6-46 



