1884. ] Microscopy and Histology. 1289 
MICROSCOPY AND HISTOLOGY: 
Impeppinc APPARATUS.—The complete saturation of objects 
more than a few millimeters in thickness with paraffine is often 
a difficult operation. After soaking for hours in melted paraffine, 
itis frequently found, when it is too late for remedy, that satura- 
tion has not been sufficiently complete in all parts of the object. 
In imbedding relatively large anatomical preparations, the pene- 
tration of the paraffine to all parts can be secured by the aid of a 
good air-pump; but this method is tedious, and robs one of time. 
The same end may be reached with very little cost of time and 
labor by means of a suction-pump, such as is used in chemical 
laboratories, provided only that the water pressure at command is 
sufficiently great to do the work. . F. W. Hoffman? has des- 
cribed a very simple apparatus to be used with the suction-pump, 
ani Bee E E T na A r ee Pw ee 
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i iccator, Æ, by 
nnected with the exsiccator, £, 
pes rtion of which runs a 
r ads i inc pan, W, conta 
è W e ie of the pan should 
re of the water can be kept quite even 
ng. The-flask, /, uced between 
ve Zoology, Cambridge, Mass. 
