18 THE Microscope. 
\ 
pered bottle, and leave for ten to fifteen days. At the end of this 
period, shake up well again and in an hour or two afterwards filter 
‘and preserve the filtrate very carefully to prevent evaporation and 
deposit of iodide crystals. This solution only stains up to a certain 
point, consequently the sections may be left in it almost indefinitely. 
—Jour. of the Royal Micros. Society. 
A New Harvenine Mersop.—Carle Bonda describes in the 
Centralblatt fiir die Medicinische Wienenschaften a new hardening 
process especially adapted to the central nerve system. It is 
briefly as follows: The material in mass (as, for instance, the brain 
of a large dog) is placed for from twenty-four to forty-eight hours 
in a ten per cent. aqueous solution of pure nitric acid, whence it is 
_ removed without rinsing into a solution of potassium bi-chromate, 
made by dissolving one volume of a cold saturated solution of the 
salt in two volumes of water. The bi-chromate solution must be 
replaced in the course of a few hours with a solution consisting of 
equal volumes of the saturated solution and water. In this the 
material is left until sufficiently hardened. It is recommended that 
brain and spinal cord be kept at least eight days in the fluid, and 
that the temperature be maintained at about that of incubation, or 
say from 100° to 110° F. The author highly eulogizes the manner 
in which material thus hardened shows up after staining with 
heematoxylin.—St, Louis Med. and Surg. Journal. 
A Beavrirut AND DuraBie Cement For Rinaine Batsam Moonts. 
—Mr. J. D. Beck sends us the following :—To a thick solution of 
gum arabic add a little glycerine to prevent cracking. Ring balsam 
mounts with this first, then finish with the same cement colored with 
magenta, or fuchsine, or the ‘‘ Diamond” black dye dissolved in 
water. Ornament with gold paint, etc., and finish with ‘‘ Winsor & 
Newton’s” mastic picture varnish. Try cemnet on a blank slide, if 
brittle when hard, add a little more glycerine, so that it will harden 
in twenty-four hours without brittleness. 
BacrertoLoaicaL Examrnations at Avutopsres.—Babes has pres- 
ented in the Archives Koumaines de Meédicine et de Chirurgie an 
extensive argument in favor of careful bacteriological examinations 
at post mortem examinations. The cadaver should be preserved at a 
temperature of 5° or 6° C. and washed in ;,';5 corrosive sublimate 
solution. The hands of the investigator should be scrupulously clean, 
