86 
PSYCIIK 
[August 
Generation 
No. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
[0 
11 
12 
13 
14 
15 
1(1 
17 
IS 
Table I'. Progcnij of a Single Pair, hi/ Genemtinns. 
No. of descendants. Remarks. 
30 De.sce]Klants of liibernating female. 
450 
6750 
101, 250 
1,518,750 
22, 781,250 
341, 718, 750 
5,125, 781, 2.50 
7(1, 886, 718, 7.50 
1, 1.53,300, 781,250 
17,299,511,718, 7.50 
2.59, 492, 67.5, 781, 250 
3,892,390, 1.36,718, 750 
,59, .885, 8.52, 050, 781, 2.50 
.898, 2.87, 7.80, 761, 718, 7.50 
13, 474, 316, 711, 42.5, 781, 250 
202, 114, 7.50, 671, 3,86, 718, 7.50 
3, 031, 721, 260, 073, .800, 781, 250 
All of this, of course, i.s purely speculation, for we have no means of actually 
obtaining vital .statistics of this kind. No allowances have been made for mortality 
in the rejtroduciug females, or in the young, and in order to make the calculation as 
conservative as possiltle, the totals should |)robal>ly be halved, on the theory that but 
half of the female ilesccndants in any one generation survive to reproduce. This 
would .still leave us in a maze of uuthinkaftle totals. The figures are merely intro- 
duced to show the possibilities in rapid rc|)roduction present in this important egg- 
parasite, and no claim i.s made that they rejire.sent anything like artiial fact. 
IdlTdfATUKE UEFEKREl) TO. 
1,892. Howard, Lelaud OssiaTi. Proc. U. S. Nat. Mu.seum, 5Yashington, XIV 
(1891), i>. .577. 
1905. (.^naiutance, .\ltus larcy and Charles Thomas Brues. The Cotton Boll- 
worm. Bull. No. .50, Bureau Ent., U. ,8. Dej). Agric., AYashington, p. 117. 
1906. Froggatt, ^Yalter. Agric. (fazette New South Wales, Sydney, XVII, ]>p. 
39CE391. 
