Edward Claypole, The Scientist—Comstock. . 17 
the direction of organic variation, the geologic aspects of 
evolution, the phenomena of glaciers, the physics of the earth’s 
interior, deposition and subsidence, continents and deep seas 
and related subjects. 
Then, in the third epoch, from 1891 to 1897, his attention 
was given very largely to the Devonian Cladodont sharks, 
of which the Ohio shales afforded him ample illustration. His 
many papers issued during these years are among the richest 
of his gifts to American geology and palaeontology. Perhaps 
none more clearly evince his unswerving devotion to truth, 
his invincible perseverance in working out minute details and 
his comprehensive grasp of the right relations of isolated facts. 
Certainly this group of papers stands secure as an enduring 
monument no less remarkable than his earlier publications on 
Palaeaspis and the Pteraspidian fishes. 
He exhibited collections of fossils and casts of Cladodonts, 
etc., at the Belgian Exposition, 1897, and read a valuable paper 
reviewing their discovery. Strong efforts were made, without 
avail, to induce him to advertise these and to obtain pecuniary 
profit from their commercial use. 
The knowledge he had acquired of Silurian and Devonian 
aspects was most ably collated in a treatise on the “Devonian 
Formations of the Ohio Basin”, which anonymously won the 
“Walker Prize” of the Massachusetts Institute of Technology, 
in 1895. It is to be regretted that this paper has not been 
given the circulation which its merits warrant. 
A new period in Dr. Claypole’s career began with his en- 
forced removal to California in 1898, primarily for the benefit 
of his invalid wife, who, however, survived him, following him 
shortly after, as if sustaining life only to ensure this compila- 
tion of the facts of his career in suitable form for presentation 
in the files of the AMERICAN GEoLocist, whose readers for thir- 
teen years were indebted to him for very much of the best of 
its contents. 
Throop Institute, at Pasadena, welcomed him to a profess- 
orship and it goes without saying that his zeal and efficiency 
there were most pronounced to the hour of his death. He 
had been in California somewhat more than three years, but it 
was characteristic of the man not to publish hastily. He had 
already begun to bring forth ripe fruit from his labors there 
