1915.] Lutz, Experiments with Drosophila ampelophila. 607 
Normal ° Starvation 
Males Females Males Females 
Baden Pe 2 ot en a ea gi 
Egg-larval Period | — 0.1270+0.0420 | —0.1609 + 0.0405 | +0.0535 + 0.0624 | — 0.1133 +0.0598 
Pupal Period x 0.1392+0.0418 | —0.2525+0.0389 | — 0.0457 = 0.0625 | —0.0274+ 0.0605 
Length Post. Cell. | + 0.1325 = 0.0626 | +0.2536 = 0.0573 
Breadth Wing +0.3176 + 0.0573 +0.1231+0.0604 
Table 1. Correlations between the Length of Adult Life and other characters. 
From Table 1 we see that in the set which were allowed to die normally 
there is a negative correlation in each sex between the length of adult life 
and the duration of the embryonic periods — those individuals which 
completed their embryonic periods quickly, probably because they were 
those whose physiological processes were working well, tended to have long 
lives. In all cases the cofficient of correlation is at least three times as great 
as its probable error so that the results may be considered statistically 
trustworthy. The same thing is seen from Table 2 in which it 1s shown that 
Normal Starvation 
| Males Females Males Females 
| 
¢ a General | 
=") Population | 7.3560+0.1015 | 7.3764+0.0922 | 6.5353-+ 0.0422 | 6.4266 + 0.0328 
fe © | Short lived 7.9837+0.1525 | 7.6905+0.1185 | 6.4929+0.0384) 6.5434+0.0565 
ct | Long lived 6.7480 0.1240 6.8211+0.1377 | 6.5750+0.0688 | 6.3394+0.0373 
Be oe General | 
28 Population 5.6440 + 0.0350 | 5.3346 +0.0306 | 6.2026+0.0297 | 5.8145 + 0.0334 
= =) Short lived 5.8211 +0.0338 | 5.4881 + 0.0359 | 6.1964 0.0393 | 5.8396 + 0.0888 
“Long lived _ 5.4724 0.0490 | 5.0632+0.0511 | 6.2083+0.0441 | 5.7958+0.0505 
‘S 3) General 
<S°) Population © 45.9643 £0.1410 | 52.4091 +0.1345 
= %| Short lived 45.5741 + 0.2218 | 51.8137 0.2086 
4! Long lived 46.3276+0.1715 | 52.8429 + 0.1674 
a a General | 
3:2 > = Population — 31.5179 + 0.1095 | 35.3595 + 0.0989 
S = | Short lived 30.9444+ 0.1652 | 35.0098 + 0.1522 
Pa ©! Long lived | 39.0517 + 0.1282 | 35.6143 + 0.1264 
e Table 2. Means. 
In the “normal” experiments the “short-lived” adults died 
before they were 32.5 days old and in the starvation experiments they died before 
they were 66 hours old. ‘The ‘“long-lived’’ ones survived these respective ages. 
