INTRODUCTORY LETTER TO SENATOR 



MOSSO 



MY DEAR Mosso : 



It is now over a third of a century since we were 

 together in Leipzig as fellow-workers in the laboratory 

 of Professor Carl Ludwig, on whom we look back as 

 the greatest teacher of the art of scientific research 

 whom we have ever known. He was a master of 

 both the two great methods of biological study 

 observation and experiment. From him we learned to 

 regard the living organism as an apparatus, of which 

 it was necessary to learn both the construction and 

 the working, and always to seek the explanation of 

 the workinof on the basis of the construction. Al- 



O 



though we have followed different lines of inquiry, 

 the fundamental conceptions taught us by Ludwig 

 have remained dominant. I look with admiration 

 upon the number and importance of your scientific 

 achievements. The pupil has proved himself worthy 

 of the master, and has taken a master's place. 



You will find in this volume, I trust, evidence of 

 Ludwig's continued influence upon my work, and 

 of my effort to follow upon a lesser scale your ex- 

 ample. The years which have passed since those 



