568 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
tlie process of their preparation for mounting, there seems to be no 
reservoir in the list of histological apparatus that is well suited to their 
use. The ordinary solid watch-glass, crystallizing dish, &c., is objection- 
able, as the cover-glass falls at once to the bottom, from which it is 
removed with difficulty, and, again, when several specimens are being 
prepared at the same time they almost invariably run together in the form 
of rouleaux , the separation of which is attended with great danger to the 
Fig. 86. 
The bottom of the reservoir as seen from 
above, with cover-glasses in position. 
Fig. 88. 
Fig. 87. 
Cross-section of reservoir. 
sections. These difficulties have rendered this otherwise very convenient 
method of handling sections, when from their nature a support is neces- 
sary, so objectionable that the cover-glass is seldom used by histologists 
for this purpose. In order to eliminate these difficulties I have devised 
the following apparatus for holding the cover-glass during the hydration, 
staining, dehydration, &c., of the sections, which I have found to work 
admirably. 
The apparatus consists simply of a ‘double dish ’ 15 cm. in diameter 
and 2*5 cm. in depth, in which glass rods are arranged parallel to each 
(60 to 70 per cent.). The cover is then placed in a paraffin oven at a temperature 
of about 50° C., where it remains until the alcohol is evaporated. This method was 
also highly recommended by Ogata in his work on the pancreas cell. It is appli- 
cable only to sections cut by the paraffin method. 
I am indebted to Dr. Theobald Smith, of the Bureau of Animal Industry, Depart- 
ment of Agriculture, and Prof. W. H. Welch, of Johns Hopkins University, for 
valuable information concerning this method-” 
