Edward Drinker Cope. — Frazer. ' 95 
In 1873 he published thirty-four scientific papers, 
Haddonfield, N. J., January 31, 1874. Dear Father * * "I sum 
up in the new Bulletin the results of my (?) study of the relations of 
the study of the Cretaceous and Tertiary formations in their points of 
contact. The result is that the beds generally pass from one to the oth- 
er, but there is an interruption in the history of life. But for animals 
and plants the period of interruption is not the same; the Tertiary 
plants were introduced long before the Tertiary animals. So there 
could have been no such great destruction after all, and it goes to 
prove that change took place in both cases by migration, not re-crea- 
tion." 
Haddonfield, N. J., March 29, 1874. Dear Father * * "I re- 
cently went over the reptiles and fishes of Wheeler's survey with in- 
teresting results. I found one new group of fishes pertaining exclu- 
sively to the waters of the Western Colorado — the only one peculiar; 
all the rest are usual forms of the east. 
Philadelphia, July 7, 1874. Dear Father. "I have just returned 
from Washington, where I have concluded a contract with G. M. 
Wheeler, of the topographical engineers, and director of the Geo- 
logical survey of the territories west of the looth meridian. By this 
I engage to work on the geology and palaeontology of the region he 
surveys, until the work is concluded (about a year) at ths rate of 
$2,500 per annum, and $30 per month additional for provisions when 
in the field, and all expenses of expedition paid." 
Summit of Sangre de Christo Pass, July 29, 1874. 
Taos, New Mexico, August 6, 1874. Dear Wife * * "We have 
now been out twelve days from Pueblo, and have landed in a new and 
peculiar country. * * The valley of Taos is the finest we have seen. 
Four streams of beautiful water flow from the mountains and unite 
to form the Rio de Taos. There are seven villages on these, mostly 
one to three miles apart which altogether contain some 6,000 persons, 
I am told. This is to an American of 'the states' a foreign country." 
San Ildefonso, N. M., August 15, 1874. Dear Wife * * "The 
pass of the Rio Grande through the Picoris Mtns. presents very grand 
scenery, embracing prodigious precipices of granite, or in some places 
basalt, which was poured out from some ancient vent. As soon as we 
come to the Picoris river which comes in from the east, the Pliocene 
'bad lands' appear, with great towers and buttresses and walls, all 
wearing away by the weather. * * Next day we rode through Em- 
buda and forded the Rio Grande at that point, having left a note for 
the doctor and party to move out to San Juan 18 miles south. We 
struck for Abiqu 40 miles w. on the Chama R. * * * ji^g ^^^^ 
day we passed over a bad land country and reach Ojo Caliente. a few 
mud houses round a very large hot spring which flows into a fine 
creek. Next day to Rito, a small place in a beautiful valley with a 
creek, the Rio del Rito. * * Some of the specimens I saw. and 
they were nothing more nor less than my old Bathmodon of Wyom- 
