Entomology. 1129 
second lot of plants instead of the first? Would it not have 
appeared that four-fifths of the insects had been destroyed ? 
hile it is evident that ultimately we must depend upon field 
experiments for demonstrating the value of methods of preventing 
the ravages of insects, the danger of error in such experiments is so 
great that it is unwise to depend upon them in working out princi- 
ples upon which such methods are based. Obviously the worker 
in applied entomology needs a laboratory and apparatus as much 
as does the chemist or physiologist ; and this laboratory should be 
different from our ordinary entomological laboratories. 
The greater number of subjects which a worker in this field 
should investigate fall under two heads: first, studies in the life- 
histories of insects: second, experiments in the destruction of 
noxious insects or of preventing their ravages. ork in neither 
of these lines can be well done in an ordinary entomological labora- 
tory. In order to make accurate investigations of this kind it is 
necessary that there should be a place where living plants can be 
ept with insects upon them, and that all of the conditions of 
growth of both plants and insects should be under control. 
We have already given an account (Ante, p. 468) of the Labora- 
tory of Experimental Entomology at Cornell University. A view 
S the exterior of this building is now furnished our readers. Plate 
XIX. 
Soon after the erection of this laboratory we found that it was 
desirable to designate it by a name which should distinguish it from 
the entomological laboratory of the University where instruction is 
given. As this, so far as we know, is the first building of its kind, 
we were forced to coin a word ; and have proposed the name Jnsec- 
tary for buildings arranged for keeping or raising living insects. 
We hope that the time is near when the need of an Insectary for 
entomological work will be as fully appreciated as is the necessity 
for a propagating house for the horticulturist or a conservatory for 
the botanist. 3 
But the building is not all the bo ots required for the ento- - 
mological work of the future. e need specially constructed 
apparatus for this work. The breeding-cages and the methods of 
observation and preservation of specimens which we have inherited 
from the last century will not meet all the requirements of the com- 
plicated problems we have to solve. There must be more accurate 
methods of observing the habits and transformation of insects, more 
ect ways of testing insecticides, and better means of preserving | 
specimens for study. It is not too much to hope that the m 
of entomology of the year 1900 will be as much in advance of those 
of to-day, as the present methods of histology are in advance of 
those of fifteen years ago. 
With the hope of stimulating the study of methods, I present 
