a4 H. Goadby on making wet Preparations of Animal Substances. 
with the hand, and the legs, by conducting the heat, mark the 
table; to render the entire apparatus more convenient, I found it~ 
better to add the mahogany board ; the holes for the legs are de- 
fended with brass plates, and they fit tightly so that the whole can 
be moved bodily out of the operator’s way. The spirit lamp (¢) 
is 14 inch square and 24 high to the top of the brass wick holder 
—exclusive of the ground glass cap. Every part of the glass 
that is to be coated with the marine glue should firstly be lightly _ 
painted with the fluid solution of it before described. Thus pre-— 
pared, the slide and the four pieces of the cell should be placed 
on the iron plate, and the heat of the lamp applied beneath. 
The position of the lamp should be frequently changed, to 
impart an equal temperature to the iron plate, for if there be too — 
great accumulation of heat at any one point, the glass will in 
stantly break: should the plate become unnecessarily hot, lower — 
the wick, or remove the lamp for a short time. 
The solid glue may be cut into long thin slips with a knife or 
scissors, and applied to the painted surface of the slide and pieces 
of the cell, until the glass be hot enough to melt it, when it should 
be distributed evenly over the glass by means of a stouter piece 
of glue held in a pair of short, strong forceps. Then search, 
or, and remove, particles of grit and dirt which are contained — 
more or less in the glue—they are best seen 
glass from the iron plate and placing it ona pi 
white paper ; they can be easily removed by the point of a knife, — 
or a piece of the solid glue. Extraneous particles are frequently — 
broken into fragments between the glasses b 
y the pressure neces — 
sary to form a joint, but they should always be removed, as they — 
. 
permanent joint. 
act mechanically as a wedge, and preclude the possibility of @— 
At a certain temperature the glue will bubble and boil, at — 
which point it should be removed from further contact with heat; 
otherwise it will be decomposed, and all its characteristics de- 
stroyed. 
For neatness and uniformity, the cells should be placed in the | 
center of the slides, and to accomplish this it is best to mark the — 
outline of the slide on paper or card-board with a pen, and then 
draw a cross, the center of which is the center of the slide, us 
limbs extending the whole length of the long and the short di- 
ameter of the figure. 
The glass being hot and the glued surfaces freed from dirt, the — 
several pieces of the cell are to be turned quickly over with 4 
pair of forceps and placed upon the slide in the relative position 
they should occupy 
The slide should now be placed on the card-board figure, each — 
ith two - 
piece of the cell should be pressed down to the dilee 
pieces of wood, and rubbed to and fro to the excess of 
4 
caches 
