loo Dr. Wollaston on Super-acid 
four of the acid present, and it requires the alkali of three 
equal quantities of the same salt to saturate the three remain- 
ing parts of acid. 
The limit to the decomposition of super-oxalate of potash 
by the above acids, is analogous to that which occurs when 
sulphate of potash is decomposed by nitric acid ; for in this 
case also, no quantity of that acid can take more than half the 
potash, and the remaining salt is converted into a definite 
super-sulphate, similar to that obtained by heat in the third 
experiment. 
It is not improbable that many other changes in chemistry, 
supposed to be influenced by a general redundance of some 
one ingredient, may in fact be limited by a new order of affi- 
nities taking place at some definite proportion to be expressed 
by a simple multiple. And though the strong power of crys- 
tallizing in oxalic acid, renders the modifications of which its 
combinations are susceptible more distinct than those of other 
acids, it seems probable that a similar play of affinities will 
arise in solution, when other acids exceed their base in the 
same proportion. 
In order to determine whether oxalic acid is capable of 
uniting to potash in a proportion intermediate between the 
double and quadruple quantity of acid, I neutralized forty- 
eight grains of carbonate of potash with thirty grains of oxalic 
acid, and added sixty grains more of acid, so that I had two 
parts of potash of twenty-four grains each, and six equivalent 
quantities of oxalic acid of fifteen grains each, in solution, 
ready to crystallize together, if disposed to unite, in the pro- 
portion of three to one ; but the first portion of salt that crys- 
tallized, was the common binoxalate, or salt of sorrel, and a 
