” 
54 J. W. Mallet on Osmious Acid. . 
course does not of itself suffice to establish the relation of iso- 
morphism between them; iridio-chlorid of potassium scems how. 
ever to be capable of erystallizing in all proportions with the - 
platino- and osmio-chlorids. i 
chlorates, but here appear to lie their closest relations. It may 
be interesting to notice some of the principal points of resem- 
