96 Scientific Intelligence. 



No. 155. Ann Arbor Folio, Michigan. Description of the 

 Ann Arbor Quadrangle ; by I. C. Russell and Frank Leverett. 

 Pp. 15, with 3 maps. 



No. 156. Elk Point Folio, South Dakota, — Nebraska — Iowa; 

 Description of the Elk Point Quadrangle; by J. E. Todd. Pp. 8, 

 with 3 colored maps. 



No. 158. Rockland Folio, Maine; by Edson S. Bastin. Pp. 

 15, with 5 colored maps. 



Bulletins. — No. 319. Summary of the Controlling Factors 

 of Artesian Flows ; by Myron L. Fuller. Pp. 44, with 7 plates 

 and 17 figures. 



No. 325. A Study of Four Hundred Steaming Tests made at 

 the Fuel-Testing Plant, St. Louis, Mo., in 1904, 1905, and 1906; 

 by Lester P. Breckenridge. Pp. 196, with 76 figures. 



No. 326. The Arkansas Coal Field ; by Arthur J. Collier, 

 with Reports on the Paleontology by David White and G. H. 

 Girty. Pp. vi, 158, with 6 plates and 29 figures. 



No. 327. Geologic Reconnaissance in the Matanuska and 

 Talkeetna Basins, Alaska ; by Sidney Paige and Adolph 

 Knopf. Pp. 71, with 4 plates and 4 figures. 



No. 328. The Gold Placers of Parts of Seward Peninsula, 

 Alaska, including the Nome, Council, Kougarok, Port Clarence, 

 and Goodhope Precincts ; by Arthur J. Collier, Frank L. 

 Hess, Philip S. Smith, and Alfred H. Brooks. Pp. 343, with 

 11 plates and 19 figures. 



No. 329. Organization, Equipment, and Operation of the 

 Structural-Materials Testing Laboratories at St. Louis, Mo. ; by 

 Richard L. Humphrey, with preface by Joseph A. Holmes. 

 Pp. vi, 84, with 25 plates and 9 figures. 



No. 330. The Data of Geochemistry ; by Frank Wiggles- 

 worth Clarke. Pp. 716. See vol. xxv, p. 458. 



No. 331. Portland Cement Mortars and their Constituent Mate- 

 rials. Results of Tests made at the Structural-Materials Testing 

 Laboratories, Forest Park, St. Louis, Mo., 1905-1907 ; by Rich- 

 ard L. Humphrey and William Jordan, Jr. Pp. vii, 130, with 

 20 plates and 22 figures. 



No. 332. Report of the U. S. Fuel-Testing Plant, at St. Louis, 

 Mo. January 1, 1906, to June 30, 1907. Joseph A. Holmes in 

 charge. Pp. 1-299. 



No. 333. Coal-Mine Accidents; Their Causes and Prevention. A 

 preliminary statistical Report ; by Clarence Hall and Walter 

 O. Snelling, with introduction by Joseph A. Holmes. Pp. 21. 



No. 334. The Burning of Coal without Smoke in the Boiler 

 Plants : a Preliminary Report ; by D. T. Randall. Pp. 26, 

 with 3 tables. 



No. 336. Washing and Coking Tests of Coal and Cupola 

 Tests of Coke, conducted by the U. S. Fuel-Testing Plant at St. 

 Louis, Mo. January 1, 1905, to June 30, 1907 ; by Richard 

 Molenke, A. W. Beldex and G. R. Delamatkr, with intro- 

 duction by J. A. Holmes. Pp. 1-76. 



