84 



SELECTION IN CLADOCERA ON THE BASIS OF 



Line 740. 



Line 740 was the first line of S. exspinosus subjected to selection. 

 It was obtained in August 1912, from Pond IV, in which S. exspinosus 

 occurs the year round. Selection was begun at once and continued 

 for 181 and 184 generations, for a period of more than 56 months, 



