488 Scientific Intelligence. 



From these titles it is evident that the paper of most popular 

 interest is the first one, on roads, by the versatile Harvard pro- 

 fessor. He treats of the history of American roads, the methods 

 of using stone in road-building, the relative value of road stones, 

 their distribution, sources of supply, etc.; and thus makes a 

 timely contribution to a subject which is receiving special atten- 

 tion in all parts of the country. 



This is the last report made by Major J. W. Powell as Director 

 of the Survey, who until recently has had charge of the work, 

 under different organizations, for twenty-five years. 



2. Topographical maps of the U. S. Geological Survey ; 

 Chas. D. Walcott, director. — The following sheets of the topo- 

 graphical maps of the edition of 1895, are published and ready 

 for distribution : 



The San Francisco sheet, Cal. ; Bryon, S. Dak. ; Alpine, 

 Tex. ; Chispa, Tex.-Mex. ; Dayton, Wyo. ; Aberdeen, S. Dak. • 

 Laramie, Albany Co., Wyo.; JBodreau, La. ; Marfa, Tex. ; Hick- 

 ory, N. C. ; Ocala, Fla. ; Fort Ann, Vt. ; Panasoff kee, Fla. ; 

 Aspen, Col. ; White Hall, N. Y.-Vt. ; Wartburg, Tenn. ; Ned 

 Lake, Mich. ; Perch Lake, Mich. ; Amsterdam, N. Y. ; Sierra 

 Blanca, Tex.; Williston, Fla.; Nomini, Md.-Va. ; Sherwood, 

 Tex. ; Duluth, Minn. ; Tsala Apopka, Fla. ; Oriskany, N. Y. ; 

 Oneida, N. Y. ; Chittenango, N". Y. ; Kingfisher, Oklahoma; 

 Willsboro, N. Y.-Vt. ; Crawford Notch, N. H. ; Tazewell, Va.- 

 W. Va. ; Citra, Fla. ; Cripple Creek (Special), Col. ; Crandall 

 Creek, Wyo. ; Ishawooa, Wyo. h. s. w. 



3. A summary Description of the Geology of Pennsylvania. 

 — This compact summary of the long series of reports of the 

 second Pennsylvania survey is now complete.* The first volume 

 of 719 pages by the state geologist, contains the descriptions of 

 the Laurentian, Huronian, Cambrian and Lower Silurian forma- 

 tions, and the author states in his preface that he has written the 

 report " in Saxon English, for the use of the people of Pennsyl- 

 vania, 1 ' in which he has " endeavored to avoid dogmatic state- 

 ments not made by a consensus of the geological opinion of 

 to-day," and he further describes the book as " almost wholly a 

 practical description of facts discovered and verified by the 

 observation of the members of the corps of the geological survey 

 in their several districts." At the end of the several chapters 

 appear full-page plates of half-sized reproductions of the fossils of 

 the formations considered in the chapter, being reproductions of 

 the figures which originally appeared in report P. 4, Dictionary 

 of the Fossils of Pennsylvania. In volume ii, the upper Silurian 

 and Devonian formations are treated in like manner ; and both 

 these volumes were published in 1892, and contain continuously 

 paged 1628 pages. 



*"A Summary Description of the Geology of Pennsylvania," in three volumes, 

 with a new geological map of the state, a map and list of bituminous mines, and 

 many page-plate illustrations. J P.. Lesley, state geologist, pp. 1-2638, plates 

 1-611. 



