-4G 
PSYCHE 
[June 
Table I. Lrnrjfh o/ Period of Inriihaiion at Different Dates, Myrtle, (la. 1906. 
Lot . 
No. 
Deposited. 
Time 
Hatched. 
Time 
Length 
Days 
of stage 
Hours. 
Effective T 
Degrees 
f. 
40. 
May 
21, 3:30 A. 
May 
2G, 12:30 P. 
5 
9. 
33.° 
2. 
53. 
22, 5:00 A. 
27, 5:00 P. 
5 
12. 
32.G7. 
3. 
30. 
22, 1 :30 P. 
28, 3:30 A. 
5 
14. 
33.50. 
1 . 
41. 
23, 8:45 P. 
29, 11:00 A. 
5 
U\. 
33.21. 
5. 
9. 
24, 1 :45 A. 
29, 11:00 A. 
5 
91. 
33.75. 
G. 
40. 
24, 9:00 P. 
30, 7 :30 A. 
5 
lOT 
33.G1. 
7. 
33. 
25, 1 :00 P. 
30, 10:45 P. 
5 
9|. 
33.4G. 
S. 
38. 
2G, 2:45 P. 
31, 8:00 P. 
5 
51. 
33.79. 
0. 
41. 
27, 12:00 M. 
JlUK 
1, 3:30 P. 
5 
34., 53. 
10. 
23. 
28, 12:30 P. 
2, 1 :45 P. 
5 
li 
35.95. 
11. 
39. 
29, 3 :25 P. 
2, 10:10 P. 
4 
G'i 
35.44. 
12. 
03 
30, 11 :45 A. 
3, 8:45 P. 
4 
9. 
37.G4. 
13. 
35. 
31, 1:00 P. 
4, 3:00 P. 
4 
2 
38.89. 
11. 
20. 
June 
2, 3:00 P. 
G, 8:45 P. 
4 
5i 
40.10. 
15. 
14. 
3, 4:45 A. 
7, 8:00 A. 
4 
3i 
10. 
IG. 
21. 
3, 5:00 P. 
8, 8:00 A. 
4 
15. 
40..50. 
.-\vcrages 
4 
23 
35.G2.° 
Glancing down the column, it is seen that even during the short period of two 
weeks, there is a gradual deerease of the period of incuhation, and a eorrespondingly 
gradual increase of the sums of effective temperatures, 'i'he exceptions are due to 
.short cool spells. 
The average of 35.G2 degrees F. agrees well with ino.st of the average sums of 
effective temperatures shown in the table. 
Period of Ilatehing. The period of hatching of an egg-mass varies somewhat, 
but averages alxmt three hours under usual .spring conditions. The eggs in anv 
single mass hatch ahno.st simultaneously. 
Number Depo.sited. 
The data obtained on this point consi.sts of but a single record, obtaineil 
by confining a jiair of adults with food. The.se were ca])tured in eopula at .5 P. M. 
May 20, lOOG, and then confined. The female de])o.sited eggs as follows: — 
