664: Scientific Intelligence. 



to the memory of James Dana Dwight, explorer, geologist, natu- 

 ralist, professor in Yale University," is a manual of that highest 

 class which should be studied alike by student, teacher, and inves- 

 tigator. To the college student it presents a comprehensive view 

 of the fundamental knowledge of that broad and composite 

 science, — geology. In adaptation to his needs there will be found 

 a clarity and simplicity of expression and avoidance of unneces- 

 sary technicalities. Numerous headings make it easy to study, 

 since the subject matter is thus clearly indicated. The diagrams 

 and maps possess a sharpness and definiteness which facilitate the 

 acquisition of ideas resting on a graphic basis. The more advanced 

 material is in a smaller type, so that it may be omitted if desired 

 from daily assignments, but is informative and stimulating to 

 both student and teacher. 



The authors have acquired preparation for the writing of this 

 book through many years of teaching of elementary and gradu- 

 ate students, and in research. As a result it not only shows a 

 clarity and balance in the presentation of subject matter, but 

 incorporates such recent views as have been soundly demonstrated. 

 It gives that general survey of progress which is desirable from 

 decade to decade for the use and reference of even the most 

 advanced of investigators. 



In the first part, the physiographic section is less voluminous 

 than in some recent texts, giving a better balanced relation and 

 making more room for the other portions of the subject matter. 

 Thus 236 pages are given to Dynamical Geology and 160 pages 

 to Structural Geology. It is the general experience of teachers 

 that the large majority of students enter upon the study of geol- 

 ogy with no previous knowledge of the biological sciences. For 

 that reason, in Part II are given eight introductory chapters on 

 such subjects as Matter and Organisms ; Evolution, the Constant 

 Change of Living Things ; Fossils, the Geologist's Time Mark- 

 ers, etc. The work is made more human by the addition of por- 

 traits of the founders of geology and a larger treatment in the 

 form of a special chapter on the geologic evidence of "Man's 

 Place in Nature." The concluding chapter is a summation enti- 

 tled " Earth History in Retrospect." 



The quality of the paper, printing, and binding are excellent, 

 and the many illustrations, largely new, not only give clearness, 

 but add attractiveness to the work. J. b. 



3. Gnuidlar/en der physicalisch-ehemischen Petrographies 

 von H. E. Boeke, Ph.D. Pp. 428, 8vo; figs. 167, tables 2. Ber- 

 lin, 1915 (Gebr. Borntraeger). — In this volume the author, who 

 is professor of mineralogy and petrography in the recently estab- 

 lished university at Frankfort-on-the-Main, has presented a work, 

 which for study and reference in certain fields of petrology will 

 undoubtedly prove very useful. A certain amount of physical 

 chemistry, applicable to petrogenetic problems, has been advan- 

 tageously introduced into their works on igneous rocks by Harker 

 and Iddings, and some of the phases of the subject are covered in 



