1896J MICKOSCOPICAL -JOUUNAL :\5d 



that its shape cannot afterwards be modified. In the 

 formalin solution the org^ans chang-e color and become of a 

 dirty bluish gray. On now placing- them in ninety-five 

 per cent, alcohol the normal color returns. Before per- 

 manently placing- the org-an in alcohol it must be washed 

 with alcohol until the latter no longer becomes cloudy. 

 The material must not be washed with water; it is left 

 in alcohol for varying- time until the normal color has ag-ain 

 fully returned ; if left longer the alcohol removes the color. 

 For a kidney or spleen twenty-four hours will be sufficient. 

 The permanent preserving- fluid is equal parts of g-lycerin 

 aud water; the material floats at first, but sinks later; the 

 color is now at its best ; after a little time the fluid becomes 

 yellowish and requires renewal. Tissues so preserved 

 have not undergone the slig-hest alteration in color during 

 nine months. The method is not applicable to the preser- 

 vation of other color than that of blood ; thus icteric liver 

 is well shown. — Int. Med. Mag-azine. 



Microscopic Objects. — Thin sections of hard substances 

 are made by cementing them to glass with Canada balsam, 

 or on an oil-stone with water, then softening- the cement 

 with heat, and turning- them over and treating- the other 

 side in the same way. They are then polished, if desired, 

 with putty-powder on silk, cloth, or leather. — English Me- 

 chanic. 



Urinary Examinations. — Dr. Lichty {Medical News) 

 holds that : 1. A continued low specific gravit}' must be 

 looked upon with g-rave suspicion, until it can be proved 

 beyond a doubt that the kidneys are normal. 2. In neph- 

 ritis, especially of the chronic interstitial type, it may hap- 

 pen that at times during- the g-reater part of the disease 

 the urine may contain no albumen that can be detected. 

 3. Casts may be present in the urine when it is impossi- 

 ble to detect any albumen by the usual tests. 4. Casts 

 are very easily destroyed in the urine by bacteria during- 

 the process of fermentation, and unless the examination 

 is made within an hour or two after the urine is passed, 

 the failure to find casts does not prove the non-existence 



