212 Tur Microscope. 
be laid out and immersed in turpentine and treated as already 
described. 
In order to mount insects, or their parts, ‘‘ without press- 
ure,” it is generally necessary to adopt only the following 
simple process :—Soak the insect for two days in equal parts of 
ordinary alcohol and water, after which transfer it to absolute 
alcohol for two days, immerse it in turpentine until it is not 
only completely permeated therewith and all air removed, but 
let it remain until it is sufficiently bleached or decolorised—in 
other words, rendered transparent—and in order to ensure this 
result it should be placed in a strong light. Select a cell, of 
the requisite depth, of pure tin or vuleanite, which affix to the 
centre of a slip with the French Liquid Glues when this is dry, 
having cleaned the interior of the cell, place within it the in- 
sect, and fill the cell with fairly thick Balsam until it presents 
a slightly convex surface above the cell, lay it aside, as prev- 
iously recommended, under cover from twelve to twenty-four 
hours so that all air may escape, put a minute drop of fresh 
Balsam upon the surface of the Balsam which fills the cell, and 
carefully place a cover, slightly warmed, upon it, close the cell 
by gentle and equable pressure, at once remove, by means of a 
soft brush and benzole, all Balsam which has exuded under the 
pressure, let the mount harden for a day or two, and then apply 
white zinc, cement or asphalte. 
Cells are to be obtained of various sizes, having pure tin 
caps to fit exactly over them, after the cover is applied, and 
these not only impart great strength and security to the cell, 
but ensure the neatest possible finish to the mount. Mr. F, 
Enock, whose exquisite entomological preparations are 
altogether unrivalled. is to be credited with this admirable 
device, as well as with various other improvements in the 
special branch of the art, to which he has devoted himself with 
such singular success. _ 
SS 
THE PREPARATION OF VEGETABLE SECTIONS. 
Whensoever possible stems, leaves, roots, petioles and wood 
should be cut fresh and sectionised as soon as may be—all such 
specimens should be kept in a mixture of equal volumes of 
