S CIENTIFIC LIT ERA T URE. 



417 



formation which, under the ordinary plan 

 of awaiting a complete survey of the re- 

 gion, would be delayed for years. Follow- 

 ing this report are papers on The Dinosaurs 

 of North America, by 0. C. Marsh ; Glacier 

 Biy and its Glaciers, by H. F. Reid ; Some 

 Analogies in the Lower Cretaceous of Eu- 

 rope and America, by L. F. Ward ; Struc- 

 tural Details in the Green Mountain Region 

 and in Eastern New York, by T. N. Dale ; 

 and one of three hundred pages on Princi- 

 ples of Pre-Cambrian North American Geol- 

 ogy, by C. R. Van Hise. All of these are 

 adequately illustrated, that of Prof. Marsh 

 having eighty-five plates. The second vol- 

 ume is devoted to papers of an economic 

 character, an account of the Geology and 

 Mining Industries of the Cripple Creek Dis- 

 trict, Colorado, having first place. The gen- 

 eral geology of the district is set forth 

 by Whitman Cross in considerable detail. 

 The plan followed involves giving the char- 

 acter of the various rock formations, the 

 evidences of action by the ancient Cripple 

 Creek volcano, and descriptions of the rocks 

 forming each of the hills in the camp and 

 vicinity. R. A. F. Penrose, Jr., describes the 

 mining geology of the district, telling what 

 ores are met with, how they occur, and the 

 way in which they were deposited. He also 

 gives detailed descriptions of the ore depos- 

 its of the various hills and gulches, and fre- 

 quently describes the veins followed by indi- 

 vidual mines. Prof. N. S. Shaler contributes 

 a paper on the Geology of the Road-building 

 Stones of Massachusetts, giving the results 

 of tests made on a considerable variety of 

 stones, with some discussion of the value of 

 the different kinds under various practical 

 conditions. The Economic Geology of the 

 Mercur Mining District, Utah, is treated by 

 J. E. Spurr. There are two monographs 

 bearing on irrigation : The Public Lands and 

 their Water Supply, by Frederick H. Newell, 

 and Water Resources of a Portion of the 

 Great Plains, by Robert Hay. The former 

 of these papers tells the character of the re- 

 maining public lands and in what States they 

 are located, and gives the available sources 

 of water in each State. The latter gives the 

 results of an investigation on a strip of coun- 

 try lying along the eastern boundary of Colo- 

 rado, this district being chosen as typical of 

 the Great Plains region. The volume is 

 VOL. L. 32 



adequately illustrated with maps, diagrams, 

 photogi'aphic views, etc. The report on the 

 Mineral Resources of the United States, with 

 which the name of David T. Day has been 

 for many years identified, appears for 1894 

 in a new form. It constitutes the third and 

 fourth of the royal octavo volumes of the 

 general Repoi't of the Survey. Mr. Day has 

 utilized the greatly increased space allowed 

 him by producing a much more valuable 

 work in his field than ever before. Iron is 

 the first of the minerals to be considered, 

 and in addition to the statistics for the 

 United States there is an account of the 

 production of iron ores in various parts of 

 the world, by John Birkinbine, and a state- 

 ment of the operations of the iron and steel 

 industries in all countries, by James M. 

 Swank. Other metals are treated by various 

 specialists or by the editor. The second of 

 Mr. Day's volumes is devoted to non-metallic 

 products. Here the account of coal produc- 

 tion, by Edward P. Parker, has first place. 

 The manufacture of coke and the production 

 of petroleum and natural gas are presented 

 by Joseph D. Weeks. William C. Day tells 

 of the year's operations in the stone indus- 

 try, Heinrich Ries contributes an account of 

 the technology of the clay industry, while 

 minor products are treated by various hands. 

 The first appearance of monazite in these 

 reports is made the occasion for a historical 

 and chemical account of the substance by 

 H. B. C. Nitze. This is the mineral used 

 in making incandescent mantles for gas- 

 burners. 



The idea that it is well to become ac- 

 quainted with the beings that they are to do 

 their professional work upon has now taken 

 firm hold upon the teachers of this country. 

 They are absorbing the many books on the 

 psychology of children that are offered to 

 them and demanding other treatises on spe- 

 cial topics not yet fully or clearly dealt with. 

 A volume that undertakes the inconspicuous 

 but fundamental task of supplying facts from 

 which the characteristics of children may be 

 learned is the collection of Child Observa- 

 tions made by students of the State Normal 

 School at Worcester, Mass., and edited by 

 Miss Ellen M. HasMl (Heath, $1.50). The 

 twelve hundred examples of children's do- 

 ings here presented are purposely confined 



