66 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Duerden, James E. — Continued. 
747. The morphology of the Madreporaria. VIII, The primary septa of the 
Rugosa.— Ann. and Mag. Nat. Hist., 7th ser., vol. 18, pp. 226-242, 21 figs., Sep- 
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The discussion is based in part upon American material. 
748. Studies of the morphology, physiology, and the development of recent 
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Duffield, M. S. 
749. The Alaska Central railway. — Eng. and Min. Jour., vol. 81, pp. 755-759, 
7 figs., April 21, 1906. 
Contains notes on the physiography and geology of Alaska. 
Dumais, P. H. 
750. Quelques apercus sur la geologie du Saguenay. — Le Naturaliste Cana- 
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Dumble, Edwin T. 
751. Age of petroleum deposits, Saratoga, Texas. — Science, new ser., vol. 23, 
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From fossils identified by Dr. W. H. Dall the age is held to be upper Miocene. 
Dutton, Clarence Edward. 
752. Volcanoes and radioactivity. (Read before the National Academy of 
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Explains the phenomena of volcanism as due to radioactivity generated in the earth. 
Eakle, Arthur S. 
753. Notes on lawsonite, columbite, beryl, barite, and calcite. — California 
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Discusses the occurrence, composition, and crystallographic and other characters of 
these minerals. 
754. Weathered pyrite. — Min. and Sci. Press, vol. 95, p. 492, October 19, 
1907. 
Eames, Richard, Jr. 
755. Copper in North Carolina. — Eng. and Min. Jour., vol. 83, p. 583, March 
23, 1907. 
Eastman, Charles R. 
756. .Dipnoan affinities of Arthrodires. — Am. Jour. Sci., 4th ser.. vol. 21, 
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757. Structure and relations of Mylo stoma. — Harvard Coll., Mus. Comp. 
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758. Mylostomid dentition.— Harvard Coll., Mus. Comp. Zool., Bull., vol. 50, 
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Discusses the relations of the dental parts in Mylostomid fishes. 
759. Types of fossil cetaceans in the Museum of Comparative Zoology.— 
Harvard College, Mus. Comp. Zool., Bull., vol. 51, no. 3, pp. 79-94, 4 pis., 2 
figs., June, 1907. 
