No. 646] TAPEWORM INFECTION 



447 



The observations recorded in the present paper make 

 it obvious that a good many of our fish and game cultural 

 practices are utterly wasted because we are ignorant of 

 those factors which ought to insure success. What is ur- 

 gently needed in the state of Washington as well as in 

 the neighboring states of the Northwest is a series of 



Biological Surveys " for the purpose of studying and 

 mapping out the various ecological factors of the regions 

 in which fish or game are to be planted. We ought to 

 know a good deal about such factors as available food 

 supply, oxygen content, temperature variations, pred- 

 atory and parasitic organisms, etc., of a place before any 

 kind of animals or plants are introduced into it. Know- 

 ing these conditions we can then intelligently fit each 

 organism into that particular environment where it will 

 thrive best. But without this knowledge we are simply 

 groping in the dark and are powerless to do any real 

 good. 



