1134 Scientific News. oe 
mathematical calculations for life-insurance companies and for 
Professor Newton. The two following years were spent in natu- 
ral history studies in Sheffield Scientific School with Professor 
Verrill and his most intimate friend, Prof. S. I. Smith. In 18 
he was appointed assistant in paleontology to Professor Marsh, 
a position he uninterruptedly held to his death. 
His life for twenty years has been wholly that of a student and 
investigator, but the published works by which he is known to 
the scientific world are not numerous or extended, though im- 
portant. His chief work was a “ Report on the Marine Isopoda 
of New England and Adjacent Waters,” published in 1880, but 
he also published not a few other papers in the American Fournal 
of Science, and elsewhere, on isopods, myriapods, and a fossil 
spider (Arthrolycosis) from the Coal-Measures. The real work 
of his life, however, will never be appreciated save by those who 
knew him well. A patient and accurate observer, possessed of 
truly remarkable logical powers, and a man of very extensive 
and most accurate knowledge, the results of his eighteen years 
work in vertebrate paleontology have been of great value, not- 
withstanding the fact that none of them have been published by 
im. In eight years’ daily intimate association with him in the 
Yale College Museum, I cannot recall an instance where his 
matured opinions and statements were assailable ; errors he made, 
of course, but they were fewer than I have ever known in any 
other person. Unfortunately, his opinions, though never gain- 
said, were not always followed. To my personal knowledge, 
nearly or quite all the descriptive portion of Professor Marsh's 
work on the Dinocerata was written by him, and was published 
without change, save verbal ones. The descriptive portion 
the Odontornithes was likewise his work, but this I cannot say 
from personal knowledge . 
orn with unsound physique, his life has been a constant strug- 
gle with difficulties that a man with a less indomitable will would 
and retiring disposition. The few intimate friends that — 
him cherished and respected him in a remarkable degree. 
w 
—Ferdinand V. Hayden, M.D., Ph.D., the well-known geol- 
, 
ogist, died December 22 at his residence in Philadelphia 7 
an illness which had confined him to his room for over a | 
and a half. 
He was born in Westfield, Mass., September 7, 
College in 1850. He afterwards studied medicine at the Al k 
1829, and ae 3 
an early age emigrated to Ohio, and was graduated from Ober 4 
