The presence of all the students of the Ecole 

 Normale brings back to me how dazzling was 

 my first enthusiasm for science. The represent- 

 atives of the faculty of Lille recall to me my 

 first studies in crystallography and fermenta- 

 tion, which opened up an entirely new world to 

 me. With what hopes I was filled when I first 

 surmised that there were laws behind so many 

 obscure phenomena. 



PASTEUR, Jubilee Speech. 



It is the cell to which the consideration of every 

 bodily function sooner or later drives us. In 

 the muscle-cell lies the riddle of the heart-beat, 

 or of muscular contraction ; in the gland-cell are 

 the causes of secretion; in the epithelial-cell, in 

 the white blood-cell, lie the problem of the ab- 

 sorption of food, and the secrets of the mind are 

 slumbering in the ganglion-cell. 



VERWORN, quoted by Wilson, The Cell in De- 

 velopment and Heredity. 



