
-~ 3- 
remaining in the digestive tract, and (2) accumulations of blood inclu- 
Sions trapped by tissues. Naturally, the most intense radiation from ra— 
dioactive lead arsenate lines the walls of the entire digestive tract 
from the esophagus to the rectum. Accumulation of feces in the rectum 
indicates a center of radiation at that point. On the other hand, pho- 
tographic prints of insect material that had the entire digestive tract 
removed previous to fixation and sectioning show an almost even distri- 
bution as revealed by the intensity of the radiation through the muscu-— 
lature system upon a negative plate. Undoubtedly a differentiation 
must exist with the uptake of different quantities of radioactive lead 
arsenate conditioned by various musculature activities. such slight 
differentiation, however, could only be detected with the aid of a den-— 
sitometer." 
F. L. Campbell, in charge of the laboratory at Takoma Park, Nd., 
concerned in fundamental studies of physiology and toxicology of insects, 
submits a number of interesting photographs and a reading statement in- 
dicating the work of equipping, systematizing, and improving methcds of 
rearing house flies for experimental purposes in a constant temperature, 
in the development of which method he has "striven for simplicity, clean- 
liness, and standardization." 
BEE CULTURE 
E. L. Sechrist, of the Davis, Calif., laboratory, writes: "A 
trip was made to the cedar forests of Eldorado County, Calif., to in- 
vestigate the reported change in the character of honeydew on the incense 
cedar. Earlier in the season it had been found that the cottony cypress 
scale was secreting, on these trees, a dark, strong-—flavored honeydew 
of which bees stored a considerable quantity. The same trees and the 
Same insects at this time were producing globules of clear white and mild, 
pleasant flavored honeydew, some of these globules being larger than peas, 
and so abundant that the nectar was running down the trunks of trees and 
covering the stones and earth under the trees. The weather at this time 
had become cold and all apiaries had been moved out of the territory 
visited. On the day of our visit the temperature was such, however, that 
bees could have flown freely. No bees were observed on this honeydew. 
Mr. Watkins reports that this flow of white honeydew usually comes much 
earlier. He has samples of this "cedar honey" that are water white and 
of excellent flavor. The chemistry department of the University of Cali- 
fornia is interested in this change in character of secretion and is 
studying the material, including branches and insects with attendant 
honeydew, which we brought back." 
W. J. Nolan, Somerset, Md., in reporting on carrying weak bee 
colonies over during the winter pericd in "compartment hives," obser- 
ved that virgin queens emerged as late as the last week in November. 
