INTRODUCTION 1 5 



years as Directors of the Zoological Laboratory. When a young man 

 finished his training under these men a position was assured, and the 

 number of graduates who are among the leaders in teaching and re- 

 search throughout the United States today is probably somewhere in 

 the vicinity of three hundred. Methods of research have changed 

 and the topics which most excited men have varied from year to 

 year like Paris fashions. At times the emphasis has been on a study 

 which like a sponge may soon be wrung dry; at others wide doors 

 into deep caves of learning have been opened where exploration still 

 continues. I believe this is inevitable. 



Wendell Holmes once said, that life is painting a picture, not doing 

 a sum, and many artists looking from the same window would each 

 paint a different picture of what each one saw. So it is with our 

 sciences. We each paint the picture as we see it and like all else in 

 life our pictures are not equally good. I believe, however, it is fair to 

 say that the Harvard gallery would at least have on its walls pictures 

 more diversified and as likely to endure as those painted through 

 the last hundred years by the teachers and students of any other 

 institution. 



