1865-67.] CHARLES FREDERICK HARTT. 159 



to ; others, added from time to time, require special 

 mention. Among the assistants whom he took to 

 Brazil were Hartt, Saint John, and William James, all 

 three noteworthy naturalists. Charles Frederick Hartt 

 came to Cambridge in 1862, for instruction at the 

 Agassiz Museum. He was already in advance of all 

 the other students as a practical geologist, having 

 worked steadily and intelligently at the geology of a 

 part of Nova Scotia and New Brunswick. I at once 

 saw his value, and followed his work with interest. 

 Although a member of Agassiz's party in Brazil, he 

 did little in the geological field, because the special 

 part of Brazil assigned to him was devoid of fossil 

 remains; but he conceived a desire to see more of 

 the country, and returned to it in 1867. This time 

 he had greater success ; and about Bahia and Sergipe 

 he collected many fossils, and really began his geologi- 

 cal survey of Brazil. In 1868, having been appointed 

 professor of geology in the new Cornell University, on 

 the recommendation of Agassiz, he organized a third 

 expedition to Brazil in 1871 ; and in company with 

 some of his pupils, he explored the Amazons River 

 region. On this occasion he succeeded in discovering 

 the Devonian system at Monte Alegre and Sierra Erere", 

 and extending the area of the Cretaceous rocks between 

 Para and Pernambuco. In these two expeditions Hartt 

 showed his great capacity as an observer and a leader. 

 After the death of Agassiz he submitted to the Brazilian 

 government a plan for a systematic geological survey 

 of Brazil, which was accepted. Having been consulted, 

 I did not hesitate to recommend the scheme to the 



