46 Psyche [February 
mometers placed inside so as to occupy as nearly as possible the 
positions of the pup, that is, care was taken to have an air space 
surrounding each bulb. Each cocoon was fastened in place by 
elastic bands and then glued or sealed with wax. 
The following tables show three different sets of conditions: 
one under normal field temperatures, one where a gradual rise 
takes place effected by placing the cocoon in an electric oven, and 
the other where a sudden drop occurs. The average length of 
time for the temperature of the inside of the cocoon to reach that 
of the surrounding atmosphere during a rise and fall was almost 
three quarters of an hour. 
Cocoon of Telea polyphemus. 
Field Conditions. 
Outside Temperature 
temperature. inside cocoon. 
TORE: 15°C 
8° 12° 
Tha 10° 
Gradual Rise. 
Surrounding Time. Temperature 
temperature. inside cocoon. 
48°C, 0 min. 48° C. 
5s My 48° 
55° Li 54° 
57° 25) 55° 
60° i = Sa 
61° Sip 59° 
62° 40 * 62° 
Sudden Drop. 
Surrounding Time. Temperature 
temperature. inside cocoon. 
10-€: 0 min. 14°C. 
a i 14° 
0° Ta 10° 
0° fen 6: 
0° oy 4° 
Cocoon of Bombyx mori. 
Field Conditions. 
Outside Temperature 
temperature. inside cocoon. 
10°C; 15e€ 
9° 12° 
Zi ts 
