100 Scientific Intelligence. 



71. — Irrigation Systems of Taxes ; by Thomas U. Taylor ; 127 

 pp., 9 pis., 2 7 tigs. 



72. — Sewage Pollution in the Metropolitan Area near New 

 York City; by Marshall Ora Leighton ; 72 pp., 8 pis., 4 figs. 



74. — Water Resources of the State of Colorado ; by A. L. 

 Fellows ; 147 pp., 14 pis., 5 figs. 



2. Glacial Formations and Drainage Features of the Erie 

 and Ohio Basins ; by Frank Leverett. U. S. Geol. Survey 

 Mon. xli, 781 pp., 26 pi., 8 figs. — The work of Leverett on the 

 Pleistocene deposits of the Great Lakes region constitutes one of 

 the chief contributions to the geology of the United States. Mono- 

 graphs xxxviii and xli are supplementary, the latter describing 

 the area between central Indiana and the Genesee valley of New 

 York. Chapters ii and iii contain a description of the physical 

 features of the region and a discussion of the changes which have 

 occurred in the drainage systems — notably those of the Ohio and 

 its northern tributaries. 



The southern border of the glacial drift is found to be not a 

 unit but formed by sheets of widely different ages. The oldest 

 deposit — Kansan or pre-Kansan — is restricted mainly to north- 

 western Pennsylvania. This sheet consists of a stony till whose 

 great age is determined by the advanced stage of weathering of 

 its pebbles, and also by its erosion. The out wash from the 

 Kansan deposits remains as terraces along the upper Ohio and 

 its tributaries. The second drift sheet — the Illinoian — presents 

 a remarkably flat surface, extending as a fringe ten to sixty miles 

 wide in front of the Wisconsin drift. It has not been found 

 farther east than Holmes County, Ohio. 



Following the Illinoian glaciation came the Sangamon and the 

 Peorian interval of deglaciation, separated by the Iowan drift 

 sheet and the main loess deposits. (Complete descriptions with 

 analyses, etc., of these deposits are given in Mon. xxxviii.) The 

 principal drift of the Erie and Ohio basins is Wisconsin, and par- 

 ticularly of the late Wisconsin stage. This is marked by strong 

 moraines on lowland and upland alike, and is described in detail 

 as the morainic systems of the Miami, the Scioto, and the Grand 

 River lobes. 



Mr. Leverett discusses in detail (pp. 710-775) the glacial lakes 

 Maumee, Whittlesey, and Warren, which formed in front of the 

 retreating ice sheet as it withdrew into the Huron and Erie 

 basins. The ancient shore lines and outlets have been located 

 with great care. It is shown that the beaches in the eastern part 

 of the Erie basin display a marked warping in contrast to the 

 nearly horizontal attitude of those farther west. 



3. Les Variations periodiques des Glaciers; par Finster- 

 \v alder et Muret. 7 me Rapport Com. Int. des Glaciers. Rap- 

 port sur Glaciers Franpais de 1900 a 1901 ; par M. W. Kilian : 



Revue de Glaciologie ; par Cn. Rabot. 92 pp., 3 pis. (Club Alpin 

 Francais. Vol. xxviii.) — The glaeiers of the Swiss Alps all show 

 a decrease during 1901 except the Boveyre glacier in the Entre- 



