70 
THE BRAIH 
pedunculated bodies, as well as the antennal lobes, in 
proportion to the size of the brain, as will be seen in 
passing from the cockchafer {melolontha) to the 
cricket, then to the ichneumon, carpenter bee, or 
solitary bee, and finally to the social hive bee, where 
these pedunculated bodies form the one-fifth part of 
the volume of the brain and the -g-xo^b of the volume 
of the whole body, while in the cockchafer it is less 
than the thirty-three thousandth. The ant, on the 
contrary, whose body is much smaller, has a much 
more fully developed brain, these bodies occupying 
nearly half the volume of the brain, or ^|^^th part of 
that of the whole body. 
It is generally admitted that the size of the brain 
is in proportion to the development of intelligence, 
and Dujardin, who made careful measurements, gives 
the following sizes : — In the worker bee the brain is 
yi^th of the body ; in the ant, th ; the ichneumon, 
^^Qth ; the cockchafer, -g-/^o^h ; the dytiscus (water 
beetle), 
Vogel (i66) has pointed out that the brain of the 
queen and drone is smaller, and Girard (48) says 
that in drones, although they are much larger, more 
especially in the head, than the workers, the brain 
is much smaller, not relatively in comparison to the 
size of the body, but actually. This agrees with the 
fact that drones are certainly not intelligent, whereas 
it is impossible to deny this faculty to the others. 
