EIT. | (478 
The first of these classes cannot enter into the 
view of a discussion of antilithics—against the 
the formation of the second and third class, these 
antilithics are calculated prophylactically to be 
useful. sg 
The urinary calculi, according to the chemise, 
contain in their composition the following bodies: 
1. Lithic acid. 
2. Phosphate of lime. 
5. Ammoniaco—magnesian phosphate. 
4. Oxalate of lime. 
5. Cystic oxide. 
6. Xanthic oxide, “ee 
_ to which may be super-added, the animal it- — 
sai ___gredient which cements the whole together. 
There are two taints of the digestive system: the — 
- lithic acid, and the phosphatic taint. It is need- 
less to observe that neither of these is healthy. 
True health, in reference to the digestive process, 
consists, in as far as the urine is concerned, not — 
in the absence of an excess of the principles of 4 
either lithic acid, or phosphatic elements, from that 
fluid—but in the absence of ability to hold these 
excesses in such a state of solution, that they — 
‘Shall freely pass out of the body. When such sus- — 
pending power is, by any very deranged action 
of the healthy digestion, taken away, deposition 
then takes place: and a clot of blood, the result of 
previous inflammation of the part; or indeed any — 
foreign or morbid body, however small at first, — 
presents a nucleus of this deposition. Herein con- — 
sists the mischief. A continuance in the system 
the perverted actions which have thus laid the — 
foundation of concretion, of whatever kind, under : 
either taint—allows perpetual, though very gradu- 
al accresion, until large or small calculi are em _ 
