358 ELDON W. SANFORD 
or antennae. The feeding was done in covered glass jars, in 
one part of which some of the paste was placed. The animals, 
when put into the jars, walked or ran about until the mouth 
parts and palpi happened to touch the food; then stopped, 
moved the palpi over the food and began to eat by opening and 
closing the mandibles. After feeding was completed the ani- 
mals were removed to a clean dish. When colored foods had 
been eaten, it was always possible to decide in a general way 
how much a given animal had eaten, for the color of the food in 
the crop showed through the transparent crop wall and the 
semitransparent region of the body wall between the third pair 
of legs. When an animal had eaten a moderate or very generous 
amount of the paste, it stopped to clean itself carefully, going 
over the whole of the anterior legs with the mouth parts, and 
drawing the antennae through the mouth parts by aid of the 
anterior legs, meanwhile apparently licking off any oil or other 
extraneous matter on them. The fat-feeding methods of 
Schliiter were also employed; that is, the smearing of the head 
and anterior body with olive oil with a brush and then relying 
on the cleaning habits of the animals to get the food into the 
mouth and crop. This method was considered inadequate and 
not practiced much, because it was so unnatural, and because 
experience showed that fat smeared on the thorax entered the 
thoracic spiracles readily, and thus gave false pictures of fat 
distribution in subsequent preparations. 
ANATOMY AND HISTOLOGY OF THE ALIMENTARY CANAL 
In view of the fact that there is a discrepancy of opinion as to 
the structure of the alimentary canal, it seemed desirable to in- 
vestigate it once more without going into unnecessary detail. 
This was undertaken as a basis for physiological work. The 
comparative lengths of the various parts in a specimen where the 
total length of the alimentary canal was 6.7 were as follows: 
oesophagus 0.25 em., crop 2.5 em., gizzard 0.25 cm., stomach 
1.3 em., small intestine 0.25 em., large intestine 1.6 cm., rectum 
0.5em. It will be noted that the crop possesses by far the largest 
