GLAND STRUCTURE, 
123 
first pap has a large quantity of honey added, but no 
undigested pollen, as Leuckart had stated. The 
drone larvae are also weaned, but in a different way, 
for in addition to honey, a large quantity of undigested 
pollen is added to the food after the fourth day. 
The following table gives the percentage of solid 
constituents of the food at various periods : — 
Queen. 
Albumen. 
Fatty 
Substances. 
Sugar. 
4514 
13-55 
20*39 
Drones. 
Under Four Days 
S5'9i 
1 1 *90 
9"S7 
Over Four Days . 
31-67 
4*74 
38-49 
Average .... 
4379 
8-32 
24-03 
Workers. 
Under Four Days. 
53'38 
8-38 
18*09 
Over Four Days . 
27-87 
3-69 
44*93 
Average .... 
40*62 
6-03 
31-51 
Microscopic examination showed that in the queen 
and worker larvae there was no undigested pollen, 
whereas in the drone larvae after the fourth day 
large numbers of pollen grains were found. In 
one milligramme no less than 15,000 pollen grains 
were counted, and these were from a number of 
different plants. Although saliva from the glands 
(especially System I.) is probably added to the food, 
this cannot, from its great variability, be entirely a 
secretion, as stated by Schiemenz. This work of Dr. 
