196 
MEMOIRS OF A VETERINARY SURGEON. 
brane, themselves in a state of change, and the elements of 
water being assimilated, carbonate of ammonia is formed; 
which, reacting on the lime salts in solution, throws down 
lime in the form of carbonates, the crystals of which present 
themselves in the shape of spherules and dumb-bells of a 
large size. These being nearly insoluble, are either ejected 
with the secretion, giving to it opalescence, as before stated, 
or they are retained in the bladder, constituting sabulous 
matter. Frequently, however, the molecular forces aggregate 
the particles together, and a calculus is the result. 
It is obvious that this change in the urine can take place 
either in the pelvis of the kidney, or the urinary cyst; 
and hence it is that we have both renal and vesicular calculi 
formed. 
Were the phosphates present in the urine, similar results 
would follow; that is to say, carbonate of ammonia being 
thus slowly added, carbonic acid gas would escape, and the 
ammonia, combining with the phosphates of lime and mag¬ 
nesia, would form the triple phosphate, the crystals of which 
are prismatic, and occasionally stellated, mixed with the 
phosphate of lime, which is amorphous.] 
MEMOIRS OF A VETERINARY SURGEON. 
THOUGHTS IN THE SICK BOX. 
By Thos. Greaves, M.R.C.Y.S., Manchester. 
(Continued from p. 74.) 
In all inquiries into great truths, we soon discover that to 
arrive at a satisfactory result, we must apply ourselves to 
almost the entire range of human knowledge ; hence we must 
set ourselves earnestly and diligently to work, and shall often 
find that we are engaged in abstruse and intricate inquiries 
seemingly foreign to the one we seek to investigate. We 
must avail ourselves, however, of every avenue that leads to 
it or from it, and shall thus find, even to our surprise, that 
many subjects, which had been but little noticed by us, con¬ 
tribute most essentially to our correct deliberations. While 
we are occupied in this all-absorbing scrutiny, we must not 
allow one fact to escape our observation, but must let each 
settle itself fairly into our mind, there to be weighed and 
scrutinised, calmly and faithfully. Knowledge thus obtained, 
