PROFESSOR SHALER 



should like to take up as a field of study. 

 Finding that I wished to devote myself to 

 geology, he set me to work on the Brachiopoda 

 as the best group of fossils to serve as data in 

 determining the Palaeozoic horizons. So far 

 as his rather limited knowledge of the matter 

 went, he guided me in the field about Cam- 

 bridge, in my reading, and to acquaintances 

 of his who were concerned with earth structures. 

 I came thus to know Charles T. Jackson, 

 Jules Marcou, and, later, the brothers Rogers, 

 Henry and James. At the same time I kept 

 up the study of zoology, undertaking to make 

 myself acquainted with living organic forms as 

 a basis for a knowledge of fossils. 



[26] 



