408 - Scientific Intelligence. 
Again, in Chapter III, on page 69, we learn of an upheaval, “ at the 
close of the Devonian age,” which “raised the elevated ground on which 
Cincinnati now stands,” and that “the force of the upheaval was such as’ 
to rend asunder the Devonian deposits, for we find them lying torn and 
broken about the base of the hill ;’"—-when in fact this “ Ohio hill,” as it 
is called, is only an outcropping of the Lower Silurian, and the Silurian 
frea spreads northward over 100 miles, before reaching the Devonian, 
and over 50 miles on the east and west, so that the “torn and broken” 
Devonian at its base is all fancy; moreover the decision that the uplift 
took place at the close of the Devonian age is not deducible from any facts 
yet observed. On page 75, it is stated that there were only sea-weeds in 
the Devonian age,—when New York long since afforded remains of Devo- 
nian ferns, and even of trees, and the Devonian of Maine and New Bruns- 
wick have more recently yielded numerous species of land plants, some of 
which Dr. Dawson refers to the Conifers, an order of plants which Prot. 
These specimens aré sufficient without proceeding further. Such im- 
perfections weaken the foundation of some of the arguments, and much 
cuts are very poor, 
8. Geological Survey of Canada: Ailas of Maps and Sections, to a¢- 
company the Report of Progress from the commencement of the Survey 1 
and of a portion of the United States, extending so far wine? 
clude part of Virginia, much of Missouri, an t to the meridian of 
is unusual excellence in ev exactness and 
available to all interested in the subject. In the extension of the ™maP 
beyond the limits of Canada, he had the assistance of Prof. Hall, the 
