Answers to Queries. r17 
added, and the slide gently warmed. Care must be taken that 
the heat is slight. Or mount in equal parts of glycerine and 
camphor water. Camphor water is prepared by wrapping 3 grms. 
of camphor in a piece of muslin, place it in a bottle containing 
1500 c.c. of water, and shake repeatedly. ‘The fluid is ready for 
use in three or four days. They may be mounted in glycerine 
jelly. Wash the deposit in weak spirit and heat the glycerine jelly 
till it is fluid. Place a drop on a warm slide, add the urinary 
deposit, and after a few seconds apply a warm cover-glass, When 
cold, scrape it away from the edge of the slide, seal with cement, 
and finish. Crystals of oxalate of lime and uric acid are well 
seen. They may also be mounted in the naphtha solution. 
Many may be preserved in the dry state best, such as urea, 
nitrate of urea, oxalate of urea, creatine, creatinine, and many 
others. They are allowed to form upon the glass slide, when they 
are thoroughly dried, under a bell jar, over sulphuric acid. Ring 
white zinc, or, better, brown cement, around the crystals, then 
apply cover, and hermetically seal. 
Calcic phosphate is usually amorphous, but occurs sometimes 
in rosettes of crystals. ‘These may readily be obtained by simply 
adding to urine a small piece of calcium chloride. ‘The precipi- 
tate is allowed to form in a conical glass, and may be mounted 
and preserved in the mother liquid. Glycerine and distilled 
water, of each, 4 fluid drms.; chloral hydrate, 5 grs.; creosote, 5 
drops; gum camphor, 2 grs. Mix, shake thoroughly, and filter. 
This is A. G. Field’s method for casts, etc. For directions, see 
Amer. M. Micro. J., Vol. VI. (1885), pp. 39 and 40. Hitchcock 
used dilute carbolic acid, with shellac, as the cement. NAA. 
060.—Urinary Deposits.—Use a logwood dye, made by 
rubbing 5 grms. of extract of logwood with an equal quantity of 
alum, and adding 100 cc. of water. Let it stand twelve hours 
and filter. Allow the urine to deposit in a conical glass for some 
hours and then pour off as much as possible of the clear fluid. 
Add to what remains an equal bulk of the stain. In two or three 
days the tube, casts, etc., will be of a reddish purple colour. 
Monnt in balsam or dammar. J; Ay Tose. 
961.—Plants.—Plants live on the simple compounds of carbon, 
hydrogen, and nitrogen, given off by animals, building up out of 
them new complex substances which animals can use as food. A 
green plant, supplied with ammonia salts, carbon dioxide, water, 
and some minerals, will grow and build up large quantities of 
proteids, fats, starches, and similar things. To do such work 
needs a supply of kinetic energy, which disappears in the process, 
being stored away as potential energy in the new compound. We 
