Geology and Mineraloyy. 333 



No. 5. The Forests of Washington — A Revision of Estimates; 

 by Henry Gannett, 36 pp., 1 map. 



No. 6. Forest Conditions in the Cascade Range, Washington; 

 by Fked G. Plummer, 39 pp., 11 pis. 



No. 7. Forest Conditions in the Olympic Reserve, Washing- 

 ton; by A. DoDWELL and T. F. Rixon, loY pp., 20 pis. 



No. 8. Forest Conditions in the Northern Sierra Nevada, 

 California; by J. B. Leiberg, 186 pp., 12 pis. 



No. 9. Forest Conditions in the Cascade Range Reserve, 

 Oreojon: by H. D. Langille, F. G. Plummer, A. Dodwell, 

 T. F. Rixon and J. B. Leiberg. With an Introduction by 

 Henry Gannett, 289 pp., 41 pis. 



No. 10. Reconnaissance from Fort Hamlin to Kotzebue Sound, 

 Alaska; by Walter C. Mendenhall, 65 pp., 9 pis. 



Water Supply and Irrigation Papers, No. 77. The 

 Water Resources of Molokai, Hawaii; by Waldemar Lindgren, 

 60 pp., 4 pis. Molokai, the fifth in size of the Hawaiian Islands, 

 is of basalt fringed by coral reefs on the south. There are no 

 impermeable strata, and the extreme porosity of the rocks allow 

 free access of sea water as well as of rain, and zones of varying 

 salinity result. 



No. 78. Preliminary Report on Artesian Basins in South- 

 western Idaho and Southeastern Oregon; by I. C. Russell, 51 pp., 

 2 pis., 3 figs. Four artesian basins are described by Prof. Russell 

 and a sketch of the general geology of the Idaho-Oregon region 

 is given. 



No. 79. Normal and Polluted Waters in Northeastern United 

 States; by M. D. Leighton, 186 pp., 17 figs., 148 analyses and 

 tables. The river systems discussed are the Merrimac, the Black- 

 stone, the Connecticut and its tributaries, the Housatonic, the 

 Delaware, and the Ohio. 



Folios. No. 87. Camp Clarke Folio, Nebraska; by N. H. 

 Darton. 



No. 88. Scotts Bluffs Folio, Nebraska; by N. H. Darton. 

 Western Nebraska shows typically the geological conditions of 

 the Central Great Plains area. It is a region of flat-lying sedi- 

 ments, including volcanic ash, not older than the Eocene, 

 Erosion has developed " bad land " topography in the soft strata. 

 As illustrations of simple structures the Camp Clarke and Scotts 

 Bluffs folios will serve as Physiographic texts. 



No. 89. Port Orford Folio, Oregon; by J. S. Diller, Taken 

 in connection with the Coos Bay folio (No. 73), the Port Orford 

 folio furnishes a description of an area adjoining the Pacific 

 coast large enough to give a clear idea of the geological structure 

 of the region. The area is chiefly occupied by pre-Cretaceous 

 schists of sedimentary origin and sandstones of Cretaceous and 

 Tertiary age. The igneous rocks are gabbros (basic and acid 

 types) with corresponding basalts, serpentines and dacite por- 

 phyry dikes. The region has undergone a series of elevations 

 and depressions apparently without faulting. 



Am. Jour. Sci.— Fourth Series, Yol. XYI, No. 94.— October, 1903, 

 23 



