282 PROCEEDINGS OP THE AMERICAN ACADEMY. 



though there seemed to be a relation of some kind. The same state- 

 ment applies to the various oxyfluorides of molybdenum and tungsten. 

 In a communication made to the British Association * at the Mont- 

 real meeting, in 1884, I stated that complex acids existed into which 

 platinum chloride entered, as, for instance, compounds of the type 

 2 PtCl.2 . R2O.J. Since then I have made various communications on 

 the same subject to the Harvard Chemical Club. I regard these com- 

 pounds as respectively phosphoric, arsenic, and antimonic oxides, in 

 which 2 PtClg replaces Og. A great amount of work on the subject 

 has been done, but as it is at least possible that a very different view 

 of the subject may be taken, I will reserve the results of my work for 

 another occasion. 



Newport, R. I., August 1, 1894. 



* Report for 1884, p. 670. 

 {To he continued.) 



