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POPULAR SCIENCE REYIEW. 
Professor Cove's {America) Labours. — We have received such a large 
number of Professor Cope’s works within the last quarter that we cannot 
possibly notice them separately. The only thing that we can do is to put 
them together and speak briefly of them. The most important is that on 
The Short-footed Ungulata of the Eocene of Wyoming/’ which was read 
before the American Philosophical Society on the 21st of Februaiy, 1873. 
This is a long and well- illustrated memoir, and it deals especially with 
Loxolophodon cornutus, a species which the author especially claims. It 
deals very fully with the subject and its allied forms, and must be read by 
all who are interested in the subject. The other papers of this author are 
On the Flat-clawed Carnivora of the Eocene of Wyoming,” read (to the 
same Society) April 4th ; The Osteology of the Extinct Tapiroid Hyra- 
chyus ; ” On Some of Professor Marsh’s Criticisms ; ” and lastly “ On 
the Primitive Type of the Orders of Mammalia, Educabilia.” We fancy 
that Professor Cope does too large an amount of work, for we imagine that 
of all subjects that of geology requires the utmost consideration, which wc 
think he hardly gives to all his subjects. Nevertheless, we thank him for 
sending us these several valuable works. 
Pnplements in the River Drift at Trenton., Rew Jersey . — Dr. C. Abbott 
has sent us a paper on this subject, which he has reprinted from the 
^‘American Naturalist” (April, 1873). It is- of considerable interest, and 
we think it establishes its author’s ideas. 
The Lateral Branches of Halonia . — In a paper in the Geological Maga- 
zine ” for April, by Mr. Carruthers, F.P.S., on Halonia and Lepidodendron, 
the author says that a fine specimen from the Dudley Coal-measures, now 
in the collection of the British Museum, shows the nature of the branches 
of Bindley and Hutton’s original species of Halonia. Mr. Dawes considered 
the alternate branches to be merely the impressions of the tubercles which 
characterise the other species of Halonia. The specimen which Mr. Car- 
ruthers has figured shows that these lateral branches attained to some 
length. In none of them is the natural termination shown. The size and 
form of the scars at the broken ends indicate that the branches were 
prolonged. 
The Bearing of the Lakes of the North-Bastern Alps on the Glacier- 
erosion Theory. — A valuable paper was that read by the Kev. T. Bonney, 
M.A., F.G.S., on this’subject, at the Geological Society, April 9th, 1873 : — 
The purpose of this paper was to test, by the Lakes of the Salzkammergut 
and neighbourhood, the theory of the erosion of lake-basins by glaciers, 
which has been advanced by Prof. Ramsay. The author premised — I. That 
an extensive glacier could not exist without a considerable area to supply it. 
2. That under no circumstances could a glacier excavate a cliff of consider- 
able height (say 1,000 feet) approximately vertical. 3. That owing to the 
proximity of the regions, a theory of excavation which applied to the 
Western and Central Alps ought to be applicable also to the Eastern Alps. 
Since then these lakes either had at their heads preglacial cirques (the very 
existence of which was incompatible with much erosive power on the part 
of a glacier), or were beneath sharp and not greatly elevated ridges of rock, 
the author concluded that they had not been excavated primarily by glaciers. 
He considered a far more probable explanation to be, that the greater lake- 
