200 REVIEWS 



The first part of the volume is devoted to a discussion of lake 

 basins, the discussion covering the origin of lake basins and of lakes, 

 the obliteration of the basins, and the deposits made in them. 



The second and larger part of the volume deals with the waters of 

 lakes. Here are included (i) Hydrology — supply and waste; (2) 

 Hydraulics, including the pressure of the water, the levels of lakes, 

 their changes, permanent and temporary, rhythmic and non-rhythmic, 

 the waves, seiches, currents, etc.; (3) Chemistry, including the com- 

 parative study of the waters flowing into the lakes, that in the lakes, 

 and that flowing from them. Comparisons are also made with sea 

 water ; (4) The temperature of lakes, including a discussion of sur- 

 face temperatures, their areal and periodic variations, comparisons of 

 the temperature of the surface water with that of the overlying air, and 

 the temperature of the sub-surface waters ; a section is also given to the 

 freezing of the lake water ; (5) Optics, including the penetration of 

 light, the color of the water, reflection, refraction, etc., under various 

 conditions; (6) The biology of lakes. Besides the more obvious topics 

 considered in this chapter, a section is given to the origin of lacustrine 

 societies, and another to the physiology of lacustrine organisms. 



In an appendix is given an outline for the prosecution of lacustrine 

 studies, and also a bibliography. 



The volume is the best brief compendium on the subject with which 

 it deals. R. D. S. 



A Preliminary Report on the Artesia?i Basifis of Wyoming. Bulletin 

 45 of the Wyoming Experiment Station. By Wilbur C. 

 Knight. 



While this report is primarily a consideration of the artesian basins 

 of the state, its first part is devoted to a summary of existing knowl- 

 edge concerning the geology of the state. The following systems of 

 rocks are represented : Archean, Algonkian, Cambrian, Devonian, 

 Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Eocene, Oligo- 

 cene, Miocene, and Pleistocene. 



The Archean is found at various points in the mountain ranges. 

 The Algonkian has a similar distribution, with a total maximum thick- 

 ness, including some igneous rock, of 20,000 feet. Following the 

 deposition of the Algonkian rock were great disturbances and eleva- 

 tions, followed by a prolonged period of erosion. The late Cambrian 



