230 Annals Entomological Society of America Tol. XIV, 
6. Plants are often found in the field infested with some 
insect which it is desirable to rear to maturity. Such plants can 
be removed from the soil and kept alive in a water culture until 
the insect matures. 
7. Many points in the life economy of Parasites may be 
studied in detail with relation to the host. 
