Professor Ch. Fred. liartt, M. A. — Sinwnds. 81 
rem thej^ were joined by Mr. J. B. Steere, of the Michigan 
University. Returning to the United States, professor Hartt 
resumed his duties at Cornell in the winter of 1872. The fol- 
lowing year he delighted the students with acourseof lectures 
upon invertebrate zoiilogy, a synopsis of which, covering six- 
teen pages, was publisiied by the university press. 
May 16, 1871, he read a paper before the American Geo- 
graphical Society of New York, on ''Recent Explorations in the 
Valley of the Amazons," which, corrected after his return 
from the above mentioned expedition, was published in the 
journal of that body for 1872 (vol. in, pp. 231-256, 1873). 
He here sketched the geology of the region about Monte- Ale- 
gre and the Serra of Erere, giving an account of the discovery 
of Devonian fossils, and recorded his observations upon the 
topograph}^ the vegetation, and the soil of the district. 
He next discussed the Carboniferous rocks and fossils of 
the Tapajos, especiallj^ those discovered at Itaituba and on 
the Igarape do Bom Jardim. The hitter locality was of un- 
usual interest on account of the prevalence of silicified fossils, 
among which may be mentioned the interiors of man}^ species 
of brachiopods.* 
In this communication Hartt also gave an account of his 
visit to the Serra of Parauaquara, maintained the impossibil- 
ity of the glacial origin of certain Amazonian deposits, and 
expressed his belief in the more or less local origin of the 
Para deposits. 
In 1874 he published some of tlie results of the Morgan ex- 
peditions under the following titles: 
"ContriVjutions to the Geology and Physical Geography of the Lower 
Amazonas. The Erere-Mont-Alegre District and the Table-Topped 
Hills," in the Bulletin of the Buffalo Society of Natural Science for 
January, 1874. 
"Preliminary Report of the Morgan Expeditious, 1870-71," and "Re- 
port of a Reconnaisance of the Lower Topajos," both in volume i of the 
Btdletin of the Cornell University, Science, 1874. 
About this time he lectured before the Natural History So- 
ciety, one of the best known student's orgarizations, upon 
"Evolution in Ornament." This extremely interesting lecture 
*See paper "On the Carboniferous Brachiopoda of Itaituba. Rio Ta- 
pajos, Prov. of ParJi, Brazil," by O. A. Derby, M. S. Bull, of the Cor- 
nell Univ., vol. I, no. 2, pp. G3; jjlates viii. 
