ENTOMOLOGICAL INSTRUMENTs, Xc. 545 
direction to those on the other. Where your pms are very 
fine and weak, you must make a hole first with a com- 
mon lace-pin; otherwise, in forcing them into the cork, 
they will bend. In labelling your specimens, you should 
stick the appellation of the genus or subgenus with a 
pin before the species that belong to it. As to the species 
themselves, you may either number them 1, 2, 3, &c., 
sticking the pin they are upon through the number, and 
denoting them by a corresponding one in your catalogue; 
or you may at once write the trivial name, with the ini- 
tial of the genus upon a label transfixed in the same 
manner. Lepidoptera cannot easily be arranged in co- 
lumns. Perhaps if sgwares, corresponding with the size 
and number of the specimens of any given species you 
wish to preserve, were made with pencil, a label of the 
trivial name of the species, or a number being placed at 
its head, it would be as good a way as any other. But 
every one must be left to his own taste in these matters. 
Wherever you can, procure a specimen of each sex of 
an insect, and where zmportant characters require it, let 
some of your Lepidopterous specimens exhibit the wnder 
side of the wings. 
In arranging insects in your cabinet, if you wish to 
have it scientific, as much as the nature of the subject 
will admit, follow the series of affinities; hut you may re- 
serve a few drawers to place in contrast analogous forms. 
As your numbers of species increase you will have to alter 
your arrangement; but as pencil lines are easily rubbed 
out, this will occasion you less trouble than if they were 
drawn with ink. You should always be careful under 
each genus to leave space for new species. 
As certain Acari, Tineide, Ptinide, &c., prey upon 
VOL. LV. ON 
