402 Scientific Intelligence. 
of the Old World, = many species were recognized as th 
found there. In 48 Dr. F. Vv. H ayden made the sncciel of f his 
us journeys into his 83 country be rdering nie upper Missouri, 
Wines, orps of Topographical Engineers, 
In the great mass of interesting pg ae brought by Dr. Hay- 
den were ber of angiospermous leaves, obtained from a 
sandstone lying at the base of the Cueasasun: formation at Black- 
bird Hill, in Nebraska, Outline sketches of some of these leaves 
were sent to the distinguished fossil Botanist, Prof. Oswald Heer, 
of Zurich, Switzerland. By him they were pronounced o of 
fnoy Gen) sent out Sg Se War Department under command of Lieut. 
Gen 
Laurus primigenia Un ng.; a broad rounded one with Populus — 
Leuce Ung., both found in the Miocene of Europe. At the same 
time the fossils themselves were submitted to me for examination, 
and regarding the so-called Populus — as Fetter fe cally cally identiea 
from ag hich they came to that ate The plant — Laurus 
e specimens all before me, I had no species ns of the 
pra flora of Europe, but only figures and descriptio 
“ier aratively few leaves up to that time found in this fo format nite 
a Dr. Debey, Steihler and others. It was, s, therefore q ¥ 
ible that we could then make an  ntliget, ORF, 
de bw vat floras, The genera recognized among ese_ plant an 
is not s rising, therefore, that Prof. Heer should have 
“a othe ee age, and ‘that this opinion sho uld be shared by 
many 0 
ous rocks in Kansas, Col apieio Arizona, New Mexico 
During these explorations I obtained from the C 
