PORTABLE BOTANICAL PRESS. 
99 
gravity, dissolves all the precipitated carbonate directed ex- 
cept one scruple. I have never been able to make it take up 
more than five and two-thirds ounces. Indeed if it did take 
up the whole, it should yield a somewhat larger proportion of 
peroxide than it really does. 
The muriated tincture of iron is used in medicine in almost 
all the cases where a chalybeate is advisable. 
ART. XVI. ON A PORTABLE BOTANICAL PRESS. By Robert 
Peter, M. D., Lexington, Ky., Correspondent of the American Journ. 
Pharm. 
The idea of this press was suggested by seeing one from 
Cincinnati, made by Dr. Locke, upon which this is a mani- 
fest improvement. It is intended for pressing and drying 
plants on botanical excursions; and supercedes the old plan 
of boards with straps and buckles. 
