I do not doubt that
it may be possible to effect, by a sufficiently low temperature,
precipitation even from solutions rich in gelatine, if experiments
in that direction were set on foot. What influence variations in
temperature may have upon the subsequent sensitiveness of the emulsion,
and whether the action of the ammonia and the bromide of potassium is
more energetic, in the absence of the elsewhere-present nitric salts,
are questions which can only be answered after thorough examination;
and the parts played by the various additions of iodide or chloride
of silver in this method of emulsification must likewise also be
ascertained by experiment. The object of this article is to point out
this rich province for research, and to induce experimenters to turn
their attention to it; for it is only after the behavior of emulsion
under all these conditions has been thoroughly examined that we can hope
to reap the best results from the new process.--_Wochenblatt_.
* * * * *
TAYLOR'S FREEZING MICROTOME.
This microtome presents all the advantages of any plan heretofore
employed in hardening animal or vegetable tissues for section cutting,
while it has many advantages over all other devices employed for the
same purpose.
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