Geology and Natural History. 423 



out by the United States Coast and Geodetic Survey 'at the 

 request of the states of Maryland and Pennsylvania. The pur- 

 pose was to accurately reestablish and mark the old line. The 

 results sliow the high accuracy for the period of the work of the 

 original survey from 1703 to 1768. A history by E. B. Matthem^s 

 of the various surveys of this line is also included. j. b. 



8. Maryland Geological Survey, volume viii, 1908, William 

 Bullock Clark, State Geologist. Pp. 486, with 26 plates and 

 27 figures. Baltimore, 1909 (The Johns Hopkins Press). — This 

 volume contains an assemblage of papers. The first part deals 

 with the highways, by Walter Wilson Crosby ; the second part 

 with the Maryland mineral industries, by William Bullock 

 Clark and Edw^ard B. Matthev^^s ; the third part is on the lime- 

 stones of Maryland with special reference to their use in the 

 manufacture of lime and cement, by Edward B. Matthews and 

 John S. Grasty. The combination of scientific character and 

 practical value which mark these papers indicates how valuable 

 to a state a Geological Survey may be and still without duplicat- 

 ing the work of the national organization. j. b. 



9. Report of the Conservation Commission of Maryland for 

 1908-1909, Bernard N. Baker, Wm. Bullock Clark, Edward 

 HiRSCH, Commission. Pp. 204, with 13 plates and 13 figures. 

 Baltimore, Dec. 31, 1909. — ^This report is the outcome on the part 

 of Maryland of the Conference of Governors called by President 

 Roosevelt at the White House on May 13-15, i908. It contains 

 chapters on mineral resources, agricultural soil resources, forest 

 resources, reclamation of swamps, water resources, fisheries, 

 oyster supply, game preservation, scenery, public health, good 

 roads, recommendations. A perusal of these chapters calls atten- 

 tion especially to the present wasteful neglect of forests and 

 public health. The value of the commission, if it succeeds in 

 educating the public to the enactment and enforcement of needed 

 state laws, will be almost incalculable. j. b. 



10. yl Preliminary Report on the Geology of the Monarch 

 Mmiing District, Chaffee County, Colorado ; by R. D. Craw- 

 ford. Pp. 78, with 11 plates and 3 figures. Bulletin I, Colorado 

 State Geological Survey, Boulder, Col., 1910. — This report gives 

 the geology of a region about five miles square situated on the 

 east slope of the Sawatch Range. Ore was first discovered in 

 1878 and since that time the district has passed through various 

 stages of prosperity, its fortunes at present being on the increase. 

 The report is, therefore, of timely appearance. The district 

 embraces an area of pre-Cambrian granite, partly enclosing an 

 area of Paleozoic limestones underlaid by some quartzite. Across 

 this older and deformed structure have broken massive intrusives 

 of post-Devonian age. The mines are reported on in detail and 

 the ores are classified under five types. j. b. 



11. Geology of the Grayback Mining District, Costilla 

 County, Colorado ; by Horace B. Patton, Charles E. Smith, 

 G. Montague Butler, and Arthur J. Hoskin. Pp. Ill, with 



