December, ’23] 
summers: refrigerator for insect shipments 
541 
high enclosed in heavy wooden tubs. These tubs were thirty inches 
high, nineteen inches in diameter at the bottom and twenty-one inches 
Fig. 6—Component Parts of Refrigerator and Shipping Box (Photo by Hood) 
in diameter at the top. The tubs did not possess covers so they were 
fitted to heavy wooden ones which were padded around the edge to 
make them as tight as possible and prevent the rapid melting of the 
ice and the escape of the cold air. To the center of each cover on the 
inside a small padded wooden block was attached which pressed down 
on the handle of the can cover to keep the latter securely in place. 
To prevent the can being thrown around inside and insure an even layer 
of ice around it, it was held centered at the bottom by three or four 
small wooden blocks and at the top by a pair of iron straps which were 
attached to the tub at the sides and were tightened around the can by 
means of two bolts. 
When the tubs were purchased there were vents in them which would 
allow the water to drain off. These were plugged so that the water 
would remain until the refrigerators were re-iced, as it would remain cold 
for some time and prevent the warming up of the contents. 
The boxes in which the parasites were to be shipped were of the same 
type which has been found to be so satisfactory for this purpose, i. e. 
