538 APPENDIX. 



hundred leagues in seven months, over a route the greater part of 

 which had naver been examined from a zoological or geological point 

 of view. His collections, though necessarily limited by the difficulty 

 of transport and the insufficient provision of alcohol, were very val- 

 uable, and arrived at their destination in good condition. Of his 

 geological observations I have said little ; but it is from him I have 

 obtained the data which have enabled me to compare the basin of 

 Piauhy with that of the Amazons. He made careful geological 

 surveys wherever he was able to do so, and has recorded the re- 

 sult of his observations in a manner which shows that he never 

 lost sight of the general relations between the great structural fea- 

 tures of the country through which he passed. At Maranham, the 

 intermittent fever, under which Mr. St. John had been suffering; 

 during the latter part of his journey, culminated in a severe illness, 

 from which he recovered under the care of Dr. Braga, who took 

 him into his own house, and did not allow him to leave his roof until 

 he was restored to health. From Maranham Mr. St. John joined 

 me at Pard, where I had an opportunity of comparing notes with 

 him on the spot. 



During the first two months of his stay in Rio de Janeiro, Mr. 

 Hartt was chiefly occupied with Mr. St. John in examining sections 

 of the Dom Pedro Railroad, of which he prepared a very clear and 

 careful geological survey, with ample illustrations. On the 19th of 

 June, 1865, he left the city to explore the coast between the Rio 

 Parahyba do Sul and Bahia ; being accompanied by Mr. Edward 

 Copeland, one of our volunteers, who gave him very efficient assist- 

 ance in collecting, during the whole time they remained together. 

 At Campos, on the Rio Parahyba, they obtained a large number of 

 fishes, beside other specimens. From that point they went up the 

 Rio Muriahy for some distance, and then, returning to Campos, as- 

 cended the Rio Parahyba to San Fidelis, where they again added 

 largely to their collections. Taking mules at San Fidelis, they 

 traversed the forest northward to Bom-Jesu, on the Rio Itabapuana, 

 and then descended that river, stopping to collect at Porto da Li- 



