2. 
1914} Longevity of Insects 325: 
capsule is threaded upon the wire. In like manner, four more 
pairs of capsules are threaded on. The advantages are that 
the holes formed by the wire give ventilation and that the sim- 
ilarity of the position of the capsules makes a numbering system 
possible. The left hand first capsule bears the number of the 
set of ten written in ink on its face—the other capsules count 
up to ten in logical sequence from left to right towards the other 
end. 
All insects were placed separately in capsules. If the in- 
sects were sufficiently duplicated in collecting, sets of capsules. 
as above described were used. Otherwise the capsules were 
placed in envelopes, bearing data as to date of collecting, 
locality, temperature of collecting and temperature of treat- 
ment. 
The envelopes or sets of capsules were placed on shallow 
wooden trays at different temperatures, room 62°F.—hot 
room 72°F or ice room 42°F. Each day the capsules were 
opened and examined, thus permitting a further change of air. 
Any insects that had died were removed and a number corre- 
sponding to the datum recorded was placed in the capsule. 
The specimens were generally simply classified to the family. 
The results are shown in the following table :— 
