Hf. Goadby on making wet Preparations of Animal Substances. 229 
there at the same time) and place marine glue on the painted flat 
surfaces of the sides; when melted put on the ends, which will 
form three sides of an open square, then quickly place the other 
side on the ends, and carefully remove it from the plate to a 
piece of wood, or paper—the former, provided with a straight 
edge (like the cutting board) is the best. While the glass re- 
mains hot enough to keep the glue soft, press together and crit- 
ically adjust the glued surfaces, taking especial care that the sides 
coincide with the angles of the brass square ; it is most important 
to remove from the glue in the joints any extraneous particles of 
dirt.. These preliminaries settled, the glass cold, and the glue 
hard, the operator will have four sides of a box—like a brick- 
maker’s mould—without top or bottom; this he may now pro- 
ceed to grind upon the metal plate by a circular motion—con- 
face of the box;) and then after melting the marine glue on the 
upper surface near the edge for the adhesion of the lower edges 
of the hollow box, this box is to be applied to the slide and the 
whole suffered to remain on the heated plate of iron long enough 
for the lower portion of the sides of the box to become suffi- 
ciently hot to form a joint with the slide, but without melting 
the joints previously made; when cold, the upper surface may 
be ground in the same manner as the bottom, and with like care, 
and when finished, the vessel will appear like figure 
. 
To give additional support and resistance to the joints, Mr. 
