T. 8. Hunt on the Theory of Types in Chemistry. 261 
no other foundation than the observed order of generation, and 
” ] Cc ‘ 
ord j 
(differentiation). When in these changes only one species is 
co 
We should endeavor to show their ordinary modes of generation. 
(See On the theory of chemical changes this Journal, xv, 226; 
L. E. & D. Phil. Mag., [4], v, 526, and Chem. Centralblatt, 1858, 
P. 849, also Thoughts on solution, this Journal, xix, 100, an 
Chem. Gazette, 1855, p. 92. bs 
-eeping this principle in mind, let us now examine the theory 
id s we have just seen, I ta 
of. .0,, H,O,, and H,O,; thus (PO,'H)0, 
Wes", )Os, and (PO,""H.)O,. ‘These radicals evidently cor- 
respond to PO, which has lost one, two and three atoms of ox- 
vec May not nit , under certain conditions 
reper rogen, as we have elsewhere suggested, ; c 
‘ate ammonia and a nitrite, and may not this reaction enter into certain pro- 
Au - hitrification? I propose at an early day to consider this question, 
; Oo 
