372 The Brain of the Embryo and Young Locust. [May, 
merable fish were captured with salt bait, or the viscera from 
the catch of the day before? This fact illustrates a most striking 
characteristic of the American fisherman—the strong conviction 
that the fish have decided preferences in the matter of bait and 
will not take any kind which is out of season. He will often spend 
the entire month of August in fruitless search rather than use 
herring or capelin and gain but a modefate success; nor could 
any argument convince him that a codfish would bite at a salt 
clam while “the fleet was using squid.” 
$0: 
THE BRAIN OF THE EMBRYO AND YOUNG LOCUST.’ 
BY A. S, PACKARD, JR. 
[ Continued from April number. | 
Structure of the Brain in the Embryo Locust.—Much light may 
be thrown upon the structure of different parts of the adult brain 
if we can trace their origin in the embryo, or in the larval and 
pupal conditions. Hence, we have, with what material we could 
obtain, made a series of sections of the embryo and different 
stages of the larva and pupa, with some results of considerable 
interest and importance. No one, we belive, has yet examined 
the topography of the brain of the embryo insect. The only 
observer who has studied the brain of the larva, as compared 
with the adult, has been Flogel. Speaking of the cockroach, he 
says : 
»” 
mm. in length. 
He says that in the Hymenoptera he has discovered much 
concerning the development of the parts of the brain; that in bee 
larve the calices are present, though very small and with thin 
walls. The peduncle and trabecula have reached their ultimate 
proportions more nearly than the cauliculus, which is still very 
thin. In the larval ants the central body and entire mushroom 
1 Adapted from the 2d Report of the U. S. Entomological Commission, Washing- 
ton, 1880. 
