REVIEWS. 429 
insects which are active nf the preparatory et ok and have the same 
abits in maturity as in the larva and pupa stage, such as the grass- 
hopper and its allies, = pdas are slow, and the metamorpho- 
sis slightly marked.. In the butterfly and bee, however, whose life 
is so distinct in the perfect state, from the caterpillar or grub, the 
changes are rapid, though gradual, and strongly marked. They are 
not Perhaps due so much to immediate physical agencies, as to the plan 
We must look deeper than si agency of sind causes in the pro- 
duction of the various forms of life. In endeavoring to solve the 
problem of life and its manifestations man may advance in knowledge 
without actually grasping the tru 
The th n vogue, oe patai by Lamarck or Darwin, o 
tter.. We must still wait patiently, and meanwhile observe, experi 
ment, and reflect, and thus continue to question nature until she yields 
La cone. rep 
foll i ks on the metamorphoses 
of insects, with the author’s general conclusions : — 
larve of insects are generally regarded as being nothing more than immature 
io tinea in the development of the egg into the imago; and th this niin more es- 
pecially 
blance in form ting of course so far as relat es to the wings) to the 
Perfect insects, ee Nevertheless, we see e that this would be a very incomplete view of the 
case. The larva and pupa undarg o changes Which have no relation to the form which 
they will ultimately assume, Wit 
of wings, to this goal, there are combined other changes bearing reference only to their 
existing wants and monan., 
Nor is th External circumstances 
act on the “ecg in its susim states as well as in its perfect condition. Those who 
believe t f great, though gradual, he influ- 
ence of 
cag conditions, whe ether acting, pas Mr. ‘Darwin has suggested, through natu- 
ral neenon or in any other manner, 
to the mature animal. And it is evident that creatures which, like the majority 
of insects, live during different periods of y 
may undergo tion, in consequence of forces 
acting on on their larval condition, no not, in E dina: sek a a 
geak to any corresponding extent, their ultimate form. 
that is to say, 
+h +t 4 
terpillar its diffe from the butterfiy to the early stage at which it 
leaves the se g; but its ac fl w 
IL p: 112, 
