10 Answers to Queries. 
360.—Urinary Deposits.—It is desirable to have the whole 
quantity passed in the 24 hours. If, however, the presence or 
absence of any particular substance be all that is desired, then a 
few ounces will be sufficient. It should be examined within a few 
hours of its secretion, although a second examination is frequently 
important after the urine has been allowed to stand 18—24 hours. 
Pour 4-—5 ozs. into a tall, cylindrical, glass vessel, and allow to 
remain for a sufficient time to allow any deposit to subside. This 
may be removed by means of a pipette. For the ordinary exami- 
nation, it is generally convenient to place a drop of the urine ona 
slide with a shallow cell. The best cell consists of a rounded, 
shallow cavity, ground in the centre of the surface of the slide. 
One made of a thin ring of dammar varnish allowed to dry also 
answers the purpose. Deposits may be preserved in Canada 
balsam, glycerine, 1 per cent. solution of carbolic acid in equal 
parts of glycerine and camphor water, in a solution of naphtha 
and creosote, and in various other media. The naphtha and 
creosote fluid is prepared as follows :—(a) Creosote, 3 drms.; (4) 
naphtha, 6 ozs. ; (c) distilled water, 64 ozs. ; (¢@) prepared chalk, a 
sufficient quantity. Mix @ and é together, then add of ¢ sufficient 
to make a thin, pulpy mass; very gradually add d, keeping the 
mixture in motion with the pestle all the while. Place the whole, 
together with a few pieces of camphor, in a lightly-covered vessel 
for two or three weeks, occasionally shaking or stirring the 
mixture, then filter, and preserve in corked or stoppered bottles 
(Beale). 
To Mount.—Let the sediment settle in a test-tube, when as 
much as possible of the urine is drawn off. Add about equal 
bulk of the preservative medium to the sediment, and shake well. 
Let it rest until the sediment settles to the bottom of the tube 
again. Draw off the preservative fluid, and add a fresh quantity 
of the fluid. By so doing, the deposit is thoroughly impregnated 
with the preservative medium. ‘The casts are well preserved in 
this solution, but the paler ones should be coloured with carmine ~ 
to show clearer. Phosphate of lime is preserved in the naphtha 
and creosote fluid. The triple phosphate crystals are best preserved 
in water to which a little chloride of ammonium has been added, 
or in strong ammonia (1 part) and water (6 parts). Cystene (a 
rare deposit), preserve in glycerine jelly or in the naphtha solution 
or in dilute acetic acid (ordinary pyroligneous acid, 1 part ; water, 
20 parts). Urates and uric acid, in weak spirit or glycerine solu- 
tion, or in the naphtha. Crystals of uric acid show nicely, 
mounted in Canada balsam. First thoroughly wash in distilled 
water, and dry carefully under a bell jar, over H, SO, (sulphuric 
acid). When dry, a drop of oil of turpentine is added, and 
allow to nearly evaporate, when a drop of Canada balsam is 
