336 Recent Literature. 
plants of the Cambrian and Silurian seas are thrown out, but 
Nematophyton, Protannularia, and some species of Buthotrephis 
are marked as genuine. A special feature is the working out more 
elaborately than in any other place of his theory of an early Rhi- 
zocarpean flora culminating in the Devonian. Much space is given 
to the flora of this period, so well developed in Acadian territory, 
and so unimportant in other countries, and his name “ Erian” is 
constantly used and specially defended. The Carboniferous flora 
takes a subordinate rank, but the extended notes to that chapter 
are crowded with valuable information, much of which would be 
new to any but the thoroughly informed specialist. The early 
Hill, is also well characterized and illustrated. The great Mio- 
cene flora, which ranks next in abundance to the Carbo 
is passed over nearly in silence, but some very important deduc- 
tions are drawn from the little florula on Green’s Creek, central 
Canada, in the Leda clay, believed by him to have been deposited 
at about the time of maximum glacial refrigeration. The work 
closes with a chapter on the origin and migration of plants, and 
fl 
ontology. A few of the more important of these may be men- 
tioned here: He accepts and reiterates the Brongniartian hypo- 
thesis of the greater abundance of carbon dioxide in the atmos- 
phere during paleozoic time, but without denying the possibility 
of the cosmical origin of portions of it, as maintained by Dr. T. 
Sterry Hunt. He insists upon the substantial uniformity of the 
