Marcu 7, 1884.] 
the general report. His labors were so valu- 
able in this connection that his chief placed 
their names jointly on the titlepage of what 
was a very able document. In addition to this 
work, Lieut. Warren was specially charged 
with compiling a general map of the entire 
region covered by the surveys. This labor 
demanded powers of analysis of a high order. 
It was needful 
to thoroughly 
study the work 
of all explorers 
to date, and, 
by assigning 
proper weight 
to each, to com- 
bine the mate- 
rial, often con- 
flicting and dis- 
cordant, into 
one consistent 
and harmonious 
whole. This 
task Warren ac- 
complished with 
surprising suc- 
cess, as has 
been proved by 
accurate  sur- 
veys subse- 
quently extend- 
ed over much 
of the ground. 
His memoir and 
map, which ap- 
peared in the 
eleventh vol- 
ume of the final 
quarto edition 
of the Pacific 
railroad re- 
ports, will re- 
main a stand- 
ard authority to 
geographers 
studying the 
early history of 
exploration in 
that region. 
As might nat- 
urally be sup- 
posed, an ambi- 
tious young officer would not be satisfied with 
office-work alone, when laurels were to be won 
in a field involving no little hardship and risk 
from the semi-hostile Indian tribes which then 
roamed unsubdued over the vast plains west of 
the Mississippi. He sought and obtained di- 
SCIENCE. 
277 
rection of three separate explorations in Dakota 
and Nebraska, in the years 1855, 1856, and 
1857; and, while thus collecting much valuable 
information needful for opening the country to 
civilization, he gratified his own strong passion 
for geological research, and laid the foundation 
for subsequent generalizations which have at- 
tracted the attention of men eminent in that 
special branch. 
Space forbids 
any notice of 
Gen. Warren’s 
Wid bre CO rd. 
here. Suffice it 
to say, that, en- 
tering the vol- 
unteer service 
among the very 
first of the offi- 
cers of the reg- 
ular army (on 
May 14, 1861), 
in two years and 
three months he 
fought his; way 
from the grade 
of lieutenant- 
colonel to that 
of major-gen- 
eral command- 
ing an arny 
corps. Hewas 
present at all 
the great bat- 
tles of the army 
of the Potomac, 
and was justly 
regarded as one 
of the best gen- 
erals and most 
gallant officers 
made known by 
the war. He 
was twice 
wounded in bat- 
tle, and had sev- 
eral horses shot 
under him. 
Immediately 
: after the fight- 
ing ceased, he 
returned to duty 
as major in the Corps of engineers, and soon 
began to perform an amount of labor in the 
civil branches of his profession which would 
have broken down a man of less nervous 
energy. To simply enumerate the various 
works with which he was charged between the 
