Springs at Lemington Priors. 244 
Is it innocent? Is it noxious? That it isinnoxious, 
I certainly know. Dr. John Johnstone (Essay on 
Mineral Poisons, p. 134.) has shewn that it may be 
taken in large doses without injury; and he has in- 
formed me, that he has since confirmed the same 
fact frequently. I wish I could as well answer the 
first question ; but what the medical virtues of this 
substance may be, is a subject which still remains in 
a great measure unexplored. It is certainly well 
worth the attention of men of science. To those 
who are inclined to labour in this field I take leave 
to suggest, that they should use either the carbonat 
or some other salt of manganese: the black oxyd, 
I apprehend, must be hardly soluble in the human 
fluids. . 
XIX. THE NEUTRAL SALTS. 
These are the same as of the other water, but 
in different quantities. The gallon contains ‘of 
muriat of magnesia 58;—muriat of soda 330;— 
sulphat of soda 62 grains. ; 
XX. THE RESIDUUM. 
A still larger residuum is obtained, after the sepa- 
ration of the neutral salts, from this than from the 
other water. The gallon leaves 146 grains. Its 
properties are the same as of that already described 
(xtiv.). 
It is to be observed, that both these springs are 
