32 G Canadian Arctic Expedition, 1913-1918 



Conclusion 



There is, perhaps, no other group of freshwater invertebrates which yields 

 so easily new facts and interesting biological features as the Crustacea; not 

 only in the Arctic, but generally. Their seemingly erratic and sporadic occur- 

 rence; the influence of the various seasons of the year upon their life-cycles; 

 the sudden "blooming forth" of certain forms in tremendous numbers in the 

 spring and early summer, and their disappearance as suddenly in the fall; these 

 and other points have long made these freshwater-invertebrates particularly 

 fascinating for study. 



It will be seen from the preceding pages, that the Phyllopods occurring in 

 the Arctic present as interesting, biological features as these from farther south, 

 though for certain species our information is as yet incomplete. For anybody 

 who spends a whole year in the Arctic there should also be something inspiring 

 in the fact, so easily ascertained, that the rich life in bodies of fresh water, not 

 to speak of the sea, continues all the year round, in spite of a low temperature 

 and of many feet of ice covering them; and that each spring and summer invari- 

 ably brings there also that exuberant vigor and fullness of life which is the 

 characteristic of all living beings under favourable natural conditions. 



Ottawa, Canada, April, 1922. 



