1885.] Scientific News. 219 
roform, while tissues containing alcohol keep steadily on the 
surface. 
When the tissue is saturated with the etherized cloroform it 
should be transferred to pure chloroform and there left for a few 
minutes. Then drop in some pellets of soft paraffine and leave it 
for two hours or more, shaking occasionally. The whole should 
then be poured into a small melting pot and a quantity of 
imbedding material added. The melting pot should then be 
placed in the water bath at a temperature of about 60° C., and 
there left until all the chloroform has evaporated, which may be 
determined by the absence of smell of chloroform on shaking. 
If much imbedding material is required this process takes a day 
or two; it is therefore better, when the solution of imbedding 
material is fairly strong, to take out the tissue and put it direct 
into pure melted imbedding material. In any case no chloroform 
must remain in the material to be cut, as it makes it brittle. Gen- 
erally speaking the more gradually these processes are passed 
through the better will be the result. 
*ry* 
oe 
SCIENTIFIC NEWS. 
blood was much richer in oxygen than sea water. It seemed to 
him that what they needed next was a careful analysis of the gases 
as they existed in the blood of fishes, more especially in that of 
some of those fishes which had been found at the depth of 2570 
