262 CILIATE FIBRILLAR SYSTEMS 



devices, such as the ultracentrifuge, and by micromethods of irradiation, 

 and the like, we may expect for the future, once the world has recovered 

 its sanity, notable advances in protistological investigations such as may 

 not have been dreamed of, even by the most sanguine of our predecessors. 

 No other group of organisms may offer more than the unicellular forms 

 toward the solution of some of our most fundamental problems. The re- 

 sults, therefore, will provide a better understanding not only of these 

 unicellular organisms, but of all forms of life. In their last analysis, how- 

 ever, all such problems must surely depend for any final solution upon 

 unique exacting methods of biological experimentation. ""Belief uncon- 

 firmed by experiment is vain" (Francesco Redi, of Florence, 1668). 



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