464 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1959 
What was originally to be a simple survey of the modes of action of 
protective devices and their evolutionary consequences has developed 
in such a way as to bear upon quite distant issues of fundamental 
interest. Laboratory workers sometimes hold that the further ex- 
ploration of comparative studies is not likely to yield much new insight 
into basic problems. This work provides an example of the manner 
in which a comparative field study can suggest the types of biological 
material best suited to the solution of the difficulties posed by special 
areas of research. 
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