BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 167 
Scott, William B. 
2153. Memoir of John B. Hatcher. — Geol. Soc. America, Bull., vol. 16, pp. 
548-555, 1 pi. (port.), 1906. 
Includes a list of his writings. 
2154. An introduction to geology. Second edition revised throughout. New 
York, The MacMillan Company, 1907. 816 pp., 17 pis., 311 figs. 
Seaman, A. E. 
Notes on the geological section of Michigan. Part I. The pre-Ordovician.— 
See Lane and Seaman, no. 1518. 
Seamon, W. H. 
2155. Observations in southwestern Chihuahua [Mexico]. — Min. World, vol. 
25, no. 11, pp. 306-308, 5 figs., September 15, 1906. 
Includes notes on the geology of the region. 
Seddon, William. 
2156. Workable coal seams of western Pennsylvania. — Eng. and Min. Jour., 
vol. 84, pp. 549-550, September 21, 1907. 
See, T. J. J. 
2157. The San Francisco earthquake of April 18. — Nature, vol. 74, p. 30, 
May 10, 1906. 
2158. The cause of earthquakes, mountain formation, and kindred phenomena 
connected with the physics of the earth. — Am. Philos. Soc, Proa, vol. 45, pp. 
274-414, 17 figs., 1906. 
2159. The nature and origin of volcanic heat. — Science, new ser., vol. 24, 
pp. 301-303, September 7, 1906. 
2160. The rigidity of the earth. — Science, new ser., vol. 24, pp. 558-559, 
November 2, 1906. 
2161. On the temperature, secular cooling, and contraction of the earth, and 
on the theory of earthquakes held by the ancients. — Am. Philos. Soc, Proa, 
vol. 46, pp. 191-299, 4 figs., 1907. 
2162. The new theory of earthquakes and mountain formation, as illustrated 
by processes now at work in the depths of the sea. — Amer. Philos. Soc, Proa, 
vol. 46, pp. 369-415, 3 pis., 5 figs., 1907. 
Seely, Henry M. 
2163. Cryptozoa of the early Champlain sea. — Vermont Geol. Survey, Fifth 
Rept. State Geol., pp. 156-173, 5 pis., 1906. 
Reviews the history of the genus, discusses its structure, occurrence, relationships, 
and classification, proposes a new order and family, and describes new species from 
Vermont and New York deposits. 
2164. Beekmantown and Ckazy formations in the Champlain Valley. Contri- 
butions to their geology and paleontology. — Vermont Geol. Survey, Fifth Rept. 
State Geol., pp. 174-187, 7 pis., 1906. 
Sellards, E. II. 
2165. Some sink-hole lakes of north central Florida. — Abstract: Science, new 
ser., vol. 23, pp. 289-290, February 23, 1906; Am. Assoc. Adv. Sci., Proa, vol. 55, 
pp. 378-379, 1906. 
2166. Systematic paleontology of the Pleistocene deposits of Maryland: 
Insecta- -Maryland Geol. Survey, Pliocene and Pleistocene, pp. 170-172, pi. 40, 
fig. 3, 1906. 
2167. Geological history of cockroaches. — Pop. Sci. Monthly, vol. 68, no. 3, 
pp. 244-250, 8 figs., March, 1906 
