90 
HISTORICAL COLLECTION. 
phrodism, imperfect developement, &c. — 5. 
Analogies between insects of different orders. 
6. Parasites of different insects, with the insects 
on which they are found. — 7. Insects directly 
injurious to man. Insects indirectly injurious ; 
as attacking animals, the horse, cow, sheep, 
&c. ; vegetables, turnips, hops, &c. ; wood 
borers, bark feeders, &c. ; with specimens of 
the injured materials. — 8. Insects useful to 
man, as cochineal, gall flies, silkworms, bees, 
&c.— 9. Dissections. — 10. Miscellaneous. 
Great care must always be taken to keep 
insects from damp; and cabinets and boxes 
should, if possible, be arranged against the 
partition wall in a dry room. 
