y 
1887] Scientific News. ; `a Eas 
Prof. James Hall, explored one of the remarkable ancient deposits 
of extinct animals, and returned with a large and valuable collec- 
tion of fossil vertebrates. He spent the three following years in 
exploring the Upper Missouri, and his large collection of fossils 
was partly given to the Academy of Sciences in St. Louis and a 
part to the Academy in Philadelphia. These collections attracted 
the attention of the officers of the Smithsonian Institution, and he 
was appointed, at the suggestion of General J. A. Logan, geologist 
on the staff of Lieutenant G. K. Warren, of the Topographical’ 
Engineers, who was then making reconnoissance of the North- 
west, and continued on duty till 1861, when he entered the war 
as a surgeon of volunteers. He was brevetted lieutenant-colonel 
for meritorious services at its close. 
In 1865 he was elected Professor of Geology and Mineralogy 
in the University of Pennsylvania, and held that post until 1872, 
when he resigned on account of the increased labor in managing 
the survey. In the summer of 1866 he made another expedition 
to the Upper Missouri. 
The United States geological survey of the Territories, under 
charge of Professor Hayden, was commenced in the spring of 
1867 and continued until 1879. Seven annual reports of the sur- 
vey have been published in 8vo, and eight volumes of the quarto 
oe report. Three volumes of the 4to series are not yet pub- 
ished. 
His reports of the exploration of the famous Yellowstone re- 
gion in 1870 and 1871 induced Congress to set apart by lawas a 
national park three thousand five hundred and seventy-five square 
miles of the public domain, containing within its limits most of 
the geysers, hot springs, and other wonders of that region. 
_ The United States owes to Dr. Hayden the establishment of 
its Geological Survey. Those acquainted with the history of 
this great work can testify to the energy and perseverance which 
he expended in accomplishing it, qualities which were in a high 
degree inherent in Dr. Hayden’s character. Dr. Hayden s influ- 
ence was only second to that of Baird in securing for science the | 
aid and recognition which it has received from the government 
of the United States. And at the period of his greatest success 
Hayden was always the same unpretentious and enthusiastic 
Seeker for knowledge. He was singularly free from sordid mo- 
tives, and he left the service of the government a poor man. 
His retirement was caused by an intrigue discreditable to all 
Who participated in it. His removal from the position which he 
oS had won through so many years of toil, was influential in bringing 
on disease to which he succumbed. 
Dr. Hayden left a widow but no children. 
