584 



PROF. LETTS AND MR R. F. BLAKE ON 



The mean results of the whole of the analyses are as follows :- 



Carbon, ........ 



Hydrogen, . . . . . . ' . 



Phosphorus, ....... 



Oxygen (by difference), . 



7336 

 7-02 



1406 

 656 



And the atomic ratios, taking the percentage of phosphorus as representing one atom 

 of that elemeut — 



Next as regards the analysis of the cadmium iodide compound. It will be seen that 

 the percentages of cadmium and iodine vary to a considerable extent in the different 

 determinations. This must be attributed to the analytical difficulties we experienced in 

 separating the two substances from such a complex body. On the other hand, the two 

 phosphorus determinations and the two combustions agree with each other exceedingly 

 well. The mean results are as follows : — 



Cadmium, 



Iodine, 



Carbon, 



Hydrogen, 



Phosphorus, 



Oxygen (by difference), 



1232 



3038 



40-74 



383 



8-25 



4-48 



10000 



and the atomic ratios, taking the percentage of phosphorus as representing 1 atom of 

 that element, 



Thus the calculated atomic ratios of the crystalline oil and of the cadmium iodide 

 compound are not very different, and so far the comparison is satisfactory. But, on the 

 other hand, if we compare the percentage numbers obtained with those required for a 

 cadmium iodide compound of either C 13 H 15 PO or C 15 H 17 PO, a total discordance is seen. 

 Thus— 



Calculated for 



Cadmium, 



(C 13 H 16 PO) a CdI 2 

 13-96 



(C 16 H I7 PO) 2 CdI 2 

 131 



Iodine, 



. 



3167 





29-7 



Carbon, . 





3890 





421 



Hydrogen, 

 Phosphorus, 





3-70 

 7-73 





39 



7-26 



In fact, no formula can be devised which will agree exactly with the analytical results 

 obtained with both the crystalline oil and its cadmium iodide compound. The numbers, 

 however, calculated for the formula Ci 4 H ]5 PO approximate pretty closely to those 

 obtained. 



