10 Bulletin of Natural Hislory Society. 
he returned to Bahia, to perfect his former work and to 
continue his observations. He worked out the geology on 
the line of the Bahia railroad in detail, and collected some 
fossils from the Cretaceous terreins of that region. He also 
studied the structure of the Abrolhos islands and reefs 
which lie off the coast of Bahia. The islands are of strati- 
fied deposits, capped with trap, while the reefs, which had 
never been to any extent examined by a naturalist, are of 
coral, generally assuming curious tower-like forms, and 
often growing together to form a large connected expanse. 
In addition to throwing new light on the formation of 
certain kinds of coral reefs, he also discovered a large num- 
ber of species of corals of which the majority were new, but 
belonged to West Indian types. The absence of many pro- 
minent West Indian genera such as Madrepora, Meandrina^ 
Diploria &c. was noted by him. The Cretaceous region of 
Sergipe was visited and yielded many fossils, which have 
been in part described by Prof. Alpheus Hyatt. 
In the short interval which elapsed between his first and 
second trip to Brazil, he was engaged in scientific teaching 
and lecturing in and near Hew York city, at the Cooper 
Institute, Pelham Priory, Adelphi Academy and other 
places where he attained much success, and made many 
warm friends who aided him in his second Brazilian expe- 
dition. In 1868, soon after returning the second time, he 
was appointed Professor of Natural History in Yassar Col- 
lege ; but he resigned this position in the autumn of the 
same year to accept the chair of Geology in Cornell Uni- 
versity, where he was retained at the head of the depart- 
ment of Geology until the time of his death. In 1869 he 
was elected General Secretary of the American Association 
to serve at the meeting of 18Y0, but before that time he 
had departed on his third trip to Brazil. 
It was in the year 1869 also, that he was married to Miss 
Lucy Lynde of Buffalo, N. Y., by whom he had two chil- 
dren, a son and a daughter. Both his widow and children 
are living. His son, now in his twenty-first year, is study- 
ing at Williams College, Mass., and his daughter at the 
