EDITORIAL. 
381 
of the introduction of the ingredients in the bag has been an objection 
to this method. Mr. Samuel ^ale, in the April number of the Phar- 
maceutical Journal, proposes a cylindrical brown stone-ware vessel, 
with a movable diaphragm capable of being supported at different 
heights in the cylinder by projecting brackets, which corresponding 
notches in the edges of the diaphragm enables it to pass to the posi- 
tion required, when by turning a little its edges will rest on the 
brackets. The object of having several ranges of brackets is to be able 
to make different quantities of tincture in the same vessel. This 
method of making tinctures has many advantages over simple ma- 
ceration • among the most prominent of which are, shorter time, the 
avoidance of agitation, absolutely necessary in the old plan, and the 
fact thatlhe upper stratum of menstruum, in contact with the ingredi- 
ents, is always the least saturated, and hence has more solvent power. 
Exhibition of Industry of all nations, to be held in London in 
1851. — There is perhaps no branch of human industry that will not be 
represented at the great Fair of 1851. Among these, chemical pro- 
ducts used in medicine and the arts, both inorganic and organic, are 
included. We presume that among the contributions from the United 
States this class of productions will not be overlooked. Some of our 
Chemical manufacturers produce articles every way equal to the 
best similar articles of European origin, and they should feel a laud- 
able ambition to stand well in this department on that occasion. 
The following is a sketch of the four great sections of the articles to 
be exhibited ; to give the sub-sections as contained in the Commis- 
sioners' announcement, would require ten of our pages. 
Section I. Raw materials and produce — illustrative of the national 
productions on which human industry is employed. 
Section II. Machinery for Agriculture, Manufacturing, Engineering, 
and other purposes, and Mechanical [Inventions — illustrative of the 
agents which human ingenuity brings to bear upon the products of 
nature. 
Section III. Manufactures — illustrative of the result produced by 
the operation of human industry upon natural produce. 
Section IV. Sculpture, "Models, and the Plastic Art generally — il- 
lustrative of the taste and skill displayed in such applications of human 
industry. 
The first Section, under the heads of substances derived from the 
mineral, vegetable, and animal kingdoms, comprehends nearly all 
substances applicable to medicine and pharmacy. 
The Commissioners will be ready to receive deposits from the 1st 
of January to 1st of March inclusive, after which date none will be re- 
