II 



Institute, Pelham Priory, and other places, where he 

 attained much success and made many warm friends who 

 aided him in his second Brazilian expedition. In 1868, 

 soon after returning the second time, he was appointed 

 Professor of Natural History in Vassar College ; but he 

 resigned this position in the fall of the same year to 

 accept the chair of Geology in Cornell University, where 

 he was retained at the head of the department of geology 

 until the time of his death. In 1869 he was elected Gen- 

 eral Secretary of the American Association for the 

 Advancement of Science, to serve at the meeting of 

 1870, but before that time he had departed on his third 

 trip to Brazil. 



While at Cornell University, when not occupied by 

 college duties, he was engaged in working up the results 

 of his Brazilian explorations, and in preparing his report, 

 as geologist to the Thayer Expedition. This report, 

 however, grew to so large a size, and was so complete in 

 itself, that it was found advisable to publish it separately, 

 in 1870, as " The Geology and Physical Geography of 

 Brazil." It forms a large octavo volume of over six 

 hundred pages and contains, in addition to an account of 

 his own researches, a resume of our previous knowledge 

 of the natural history of the country. It is thus not 

 limited to a discussion of the subjects indicated by the 

 title, but treats of the topographical and general features 

 of the countr}', of its flora and fauna, both marine and 

 terrestrial, and its mining, agricultural, commercial, and 

 manufacturing interests. The numerous maps and 

 sketches, with which it is illustrated, were drawn b}' 

 Prof. Hartt himself The greater part of them represent 

 regions never before depicted. The subjects discussed, 

 mostly from personal observations, are the following: 

 The provinces of Rio de Janeiro and Espirito Santo; the 

 Mucury and Jequitinhonha basins in MinasGeraes; the 

 Abrolhos Islands and Reefs; the Southern coast of Ba- 

 hia, and the vicinity of the city of Bahia and the Bahia 

 Railroad; the provinces of Sergipe and Alagoas ; the 

 basin of the Rio Sao Francisco below the Falls; and the 



