Geology and Mineralogy. 307 



first intrusive ; it preceded and was of sufficient mass to control 

 the large regional metamorphism which followed. The secondary- 

 lines so developed determined the direction of the granite intru- 

 sion that accompanied the regional movement. The great 

 Lantern Hill quartz is considered to have originated from a more 

 or less complete replacement of alaskite by quartz during the 

 pneuraatolytic stage of granite intrusion. The bulletin as a 

 whole is distinctly petrographic in character. f. w. 



4. DamCs Manual of Mineralogy ; for the Student of 

 Elementary Mineralogy, the Mining Engineer, the Geologist, 

 the Prospector, the Collector, etc.; by William E. Ford. New 

 edition, entirely revised and rewritten. Pp. 460 ; with 357 text 

 figures and 10 half-tone plates. 1912. New York (John Wiley 

 & Sons) and London (Chapman & Hall). — Dana's Manual has 

 played an important part in the elementary instruction in Miner- 

 alogy since its first publication in 1848. The work has been 

 revised several times and in 1878 it was rewritten and an extended 

 chapter on petrography added. A fourth edition, further revised, 

 was issued in 1887, but though many times reprinted, twenty- 

 five years have now passed since any change has been made in 

 the text. There has been, therefore, a pressing call for the 

 thorough working over of the volume, which has been ably 

 accomplished by Professor Ford. In fact, the book as now 

 issued is from beginning to end a new one although carried out 

 on the same lines as its predecessors. The wide experience of 

 the present author in teaching elementary classes in mineralogy 

 has enabled him to present the whole subject in a thoroughly 

 fresh, clear, and concise form. 



Thus, starting from a book of well-recognized merits in its 

 earliest forms, he has produced a work which should be widely 

 useful not only in elementary instruction but also meet the needs 

 of those interested in the science on the practical side. 



In the arrangement of species, the chemical order has been 

 followed instead of bringing the compounds of a given metal 

 together as in earlier editions. But the end aimed at in that 

 method has been accomplished by the addition of a chapter 

 detailing for each metal the prominent species and giving the 

 essential facts in regard to their occurrence as ores. The ex- 

 tensive chapter on " Rocks " of the two preceding editions has 

 been omitted since several books on this special subject are now 

 available ; a brief chapter is included, however, giving the chief 

 types of rocks and the minerals prominent in their formation. 



The concluding section of the volume is given to a series of 

 determinative tables based upon physical characters. In this the 

 prominence of the individual species is indicated by the character 

 of the type employed. In an appendix a summary is given of the 

 mineral production for the United States in 1910; it is stated 

 that these tables are to be revised from time to time so as to keep 

 the information given as nearly as possible up to date. 



The illustrations in the text are for the most part new, and a 

 series of half-tone plates give reproductions of typical specimens. 



