398 Dr. Wollaston's Analysis of 
generally to be felt in the pineal gland, have this for their 
basis ; for I find that after calcination they crystallize perfectly 
from marine acid. 
I have likewise met with the same compound in a very pure 
state, and soft, contained in a cyst under the pleura costalis. 
On the contrary, ossifications (properly so called) of arte- 
ries and of the valves of the heart, are similar to earth of bones, 
in containing the redundant calcareous earth ; and I believe 
also those of veins, of the bronchia^, and of the tendinous por- 
tion of the diaphragm, have the same excess ; but my expe- 
riments on these were made too long since for me to speak with 
certainty. 
To these I may also add the incrustation frequently formed 
upon the teeth, which, in the only two specimens that I have 
examined, proved to be a similar compound, with a very small 
excess of lime. 
Though I do not at present presume to draw conclusions 
with regard to the treatment of all the diseases in question, 
some inferences cannot pass unobserved. 
The sand from the pineal gland, from its frequency hardly 
to be called a disease, or when amounting to disease most cer- 
tainly not known by its symptoms, would, at the same time, 
if known, be wholly out of the reach of any remedy. 
The calculi of the prostate are too rare, perhaps, to have 
been ever yet suspected in the living body, and are but indi- 
rectly worthy of notice. For if by chance one of them should 
be voided with the urine, a knowledge of its source would guard 
us against an error we might otherwise fall into, of proposing 
the usual solvents for urinary calculi. 
The bone-earth calculus, although so nearly allied to the 
