278 University of California Puhlications in Zoology [You 18 



ture increases from its lowest to its middle value (18?0C-18?9C) 

 where the minimum, 58, occurs. Relative to the two remaining groups 

 the frequency of solitary forms increases from 71 to 91 as the tempera- 

 ture increases, while that of aggregate forms decreases from 89 to 86. 

 Be it noted that the former increase accords with theory, while the 

 latter less significani decrease does not. 



2. The frequency of both generations in the coldest water exceeds 

 that in the warmest, and that of solitary forms in the next coldest w'ater 

 exceeds that in the next warmest by 15^86-71, while the correspond- 

 ing frequencies of aggregate forms, 86 and 89, are reversed in order. 

 Here again, the former excess which accords with theory, is much more 

 significant than the latter deficiency which does not accord with theory. 



3. Except for an insignificant decrease from 189 to 184 aggregate 

 forms per hour relative to the two highest temperature groups, their 

 abundance parallels the frequency of solitar.y forms exactly. Is it not 

 striking that the abundance of 400 per hour relative to the next lowest 

 group, exceeds significantly that of 189 per hour relative to the next 

 highest group, which accords with theory, while all the relations not 

 in accord with theory are comparatively insignificant, i.e., the decrease 

 from 89 to 86 in frequency of aggregate forms and from 189 to 184 

 in their abundance instead of an increase relative to the two highest 

 temperature groups; and the deficiency instead of an excess in fre- 

 quency of aggregate forms (86) relative to the next lowest temperature 

 group as compared to that (89) relative to the next highest group? 



4. Solitary forms increase in abundance from 60 to 65 to 73 to 143 

 to 378 per hour as the temperature increases from its lowest to its 

 highest value. 



Attention is called to the fact that the abundance of solitary forms 

 relative to the next lowest temperature group (as given by tables 11, 

 12, and 13) has decreased from 73 to 72 to 65 per hour as the number 

 of groups has been increased from 3 to 4 to 5. Obviously, this accords 

 with the fact that solitary forms decrease in abundance as the tem- 

 perature of the water decreases. But, the abundance of solitary forms 

 in the coldest water has increased from 52 to 54 to 60 per hour as the 

 number of groups has been increased from 3 to 4 to 5. Apparently, 

 this fact carries an implication directly contrary to the above. But, 

 it accords with the theory of chain locomotion. For, does this theory 

 not stipulate that a larger number of solitary forms should be encount- 

 ered in the coldest water than would be present were they not pulled 

 there by virtue of the combined locomotive power of the aggregate 



