" I CAN find no intelligible ground for refusing to say that 

 the properties of protoplasm result from the nature and 

 disposition of its molecules." T. H. HUXLEY " On the Phy- 

 sical basis of Life," Edinburgh, November 8, 1868. 



" No one who is awake to the tendencies of thought and work 

 in physiology can fail to have observed that the best minds 

 are concentrated . . . upon those questions which relate to 

 the elementary endowments of living matter." Sir JOHN 

 BURDON SANDERSON, Address to Section of Biology, Meeting 

 of British Association, 1889. 



