92 



SELECTION IN CLADOCERA ON THE BASIS OF 



Table 41. — Summary of selection data by broods for Line 757 plus — Continued. 



•Probably two broods, the first brood having been overlooked until the second appeared. Inasmuch 

 aa the second brood (if there were two) was a day old before this test was made, the first brood must then have 

 been near 72 hours old. Obviously data for thrcc-day-old individuals is not strictly comparable to the other 

 data, nearly all of which was obtained from individuals less than 24 hours old. Hence, much as the writer 

 dislikes to cull his data in any manner, the data for this day's test is omitted. However, it may be added that 

 thia ia the only instance in the data of this publication in which any data has been rejected. 



