538 APPENDIX. 
hundred leagues in seven months, over a route the greater part of 
which had never 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 sufferino' 
' O 
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 Para, 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- 
