Geology and Natural History. 597 
No. 2, announced on page 236, has been issued more than a month. 
After papers by Cope, referred to in that notice, there follows one 
y L. Lesquereux on the ee neuf and relations of the flora 
of the Dakota Group of the Cretaceous. The genera represented 
are Pterophyllum (Cycad) doubtful; Liquidambar, Populus, Salix, 
Fagus, Betula, Myrica, Quercus Ficus Platanus, Laurus, Sassa- 
lia, Liriodendron, Menispermum, Paliurus, Rhamnus, Juglans or 
ht Us, a nearly all of which now exist and characterize the 
N orth American flora. “Indeed, all the essential arborescent 
r y serra 
rus, anid the serr dere Bet ula, Alnus, (alist, ’ Carpinu wide 
Carya, ete.” The Dakota species are marked by the ives being 
entire and coriaceous, excepting a “peculiar short denticulation 
with. outside sera teeth, as ght tne Haydenii, P. flabeliata, 
Platanus Newberr i, Quercus Mudgii. The flora is remarkable 
for its distinctness Pech that of the Lispotiis beds, and also for the 
absence of any European species of the same age. 
The closing article is an important one by James T. Gardner on 
the shay on Mountain ranges in Colorado. 
4, Geological and Natural History Survey of Rilserttt 
Bruierve 4 feet above the sea level. The clay a sttadhied a the 
vertebre contains numerous fragments of Bala Dr. 
will describe the oad in a paper to be read before the institute 
of Natural Scienc 
6. Note on Pro if " Heer’s new work on the Fossil Flora of the Are- 
tic; by L. Lesquerevx. (Communicated.)—I have received 
Prof. Heer a most interesting pamphlet on the Swedish expeditions 
for the explorations of the high north. In this paper the celebrated 
essor gives first an abridged narration of the progress and cas- 
ualties of these explorations, and then sums up ina masterly man- 
ner the results obtained for vegetable paleontology, as far at least 
as they were recogni a preliminary examination of an im- 
Mense amount of material polthcted and sent to him. 
