72 ARACHNIDES. 
without which it will be impossible to set them up in any way 
without their breaking. 
Mr Bullock recomieenntads that Crabs and all whic Crus- 
taceous animals, should be immersed in corrosive sublimate 
and water for an hour previous to their being put into atti- 
tudes. 
When the joints become loose they are in general attached 
by glue, but the cement is much better. 
N.B.—On no account whatever use warm water in cleaning 
_ Crustaceous animals as it is certain to change their colours. 
C ILA.P.. Jey. 
OF PRESERVING SPIDERS, GALLY-WORMS, AND INSECTS, 
CLASS VII—ARACHNIDES. 
This Class includes all animals of the Spider kind. These 
were formerly arranged amongst insects, but they have been 
formed into a separate class by Lamarck. 
The general directions which we shall give respecting | 
insects, hold good as to Spiders, only we must mention 
_ there is considerable difficulty in preserving the bodies of 
Spiders, which generally, in a very short time, shrink into a 
shapeless mass. To prevent this, the body should be pricked 
_ with the triangular awl, plate VI. fig. 8, and the contents 
pressed out; it should then be stuffed with very fine carded 
cotton or down, which can be pushed in by a heckle tooth, or 
_ one of the prickers, Nos. 9. and 10. of plate VI, blunted a 
little at the point. When properly distended, the small aper- 
ture should be filled up with a little cement, or a solution of 
gum-arabic. The legs of the larger species, such as the 
Bird-catching Mygale (Mygale avicularia), and the Scorpions, 
are also liable to shrink, and should be stuffed i in the same 
manner as that of the body. 
In those species of Spiders which we have thus prepared, 
