476 PRACTICAL ZOOLOGY 



usually recognized, pure science and applied science. Pure 

 science deals with facts without regard to their practical value 

 to mankind. Applied science applies the facts of pure science 



Fig. 324. — Gregor Mendel. (From Punnett.) 



in such a way as to benefit mankind. Thus pure science comes 

 first and is necessary before anything practical can be accom- 

 plished. Occasionally, however, a scientist appears who is 



