1883. ] Microscopy. 1089 
this key Professor Campbell proceeds to read the inscriptions. 
It is too soon to say a word about the merit of this work, an 
we shall wait with considerable impatience for the volume, ex- 
plaining more thoroughly the method. 
MICROSCOPY.' 
TuHoma’s SLIDING MicroToME, IMBEDDING METHODS ( Continued 
Jrom p. 998) —Professor Thoma adds to his description of his 
microtome some remarks on the imbedding methods more gen- 
erally used. The method of treating tissues with gum arabic, 
first brought into use by Rindfleisch and Ranvier, is now very 
generally known and practiced. The same may be said of the 
method of cutting sections between two pieces of elder pith or 
hardened liver, &c. These in certain conditions are very useful 
x and covered with the fluid. The preparation cannot, how- 
ever, be immersed directly in alcohol for the purpose of harden- 
ing. It must be first hardened by alcohol steam, taking care 
Never to raise the temperature of the steam above 30° C. For 
md purpose Professor Thoma uses a simple apparatus represented 
n Fig. 6, 
A shallow water-bath, a, stands on an iron tripod, 666, and is 
heated by a small flame, c. The water- =h 
bath is covered by athin plate, dd. Upon 
is plate is a small glass vessel, e, filled 
with common alcohol and covered with 
a perforated disk of tin, ff On this 
eik are placed the paper boxes, gg, 
containing the specimens and the imbed- 
Ing fluid. The latter and the alcohol 
vessel are again separated from the ex- 
ternal air by a glass cover, Æ% This 
es, slightly heated, will harden / i ; 
= imbedding masses within a few days, +6 Appere heir 
atter which time they are removed and dening egg-emulsion. 
Subsequently fully hardened in a bottle 
ins 
Edited by Dr, C. O. Wutrman, Newton Highlands, Mass. 
A 
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