430 Scientific Intelligence. 



silver, and gold. These subjects are treated, as is implied in this 

 statement, with admirable fullness, particularly with reference to 

 the geographical distribution, and liberal illustrations are intro- 

 duced whenever called for. Mineralogists will be gratified to see 

 this great work gradually drawing on toward completion. 



6. Manual of Determinative Mineralogy with an Introduction 

 on Bloiopipe Analysis ; by George J. Brush. Revised and 

 enlarged, with entirely new tables for the identification of min- 

 erals, by Samuel L. Penfield. Fifteenth edition, pp. x, 312. 

 New York, 1898 (John Wiley & Sons). — The thorough revision 

 which Prof. Penfield has now given to Brush's Determinative 

 Mineralogy completes the work begun by him two years since. 

 In the edition of 1896 (this Journal, ii, 459, 1896) the opening 

 chapters descriptive of the blowpipe and chemical methods and 

 reactions applicable to minerals, were carefully rewritten and made 

 to embody the practical results of the author's long experience in 

 teaching. At the present time this introductory portion of the 

 work has been further improved by the addition of a chapter 

 upon crystallography and the physical characters of minerals, in 

 which these subjects are concisely but clearly presented. More 

 important than this, the determinative tables have now been 

 rewritten, rearranged and enlarged so as to include all recently 

 described species of definite character. The changes which have 

 been made here are fundamental and highly important for the 

 student, since in their present form the tables show with admir- 

 able distinctness the fundamental differences in chemical compo- 

 sition which form the basis of the grouping of the species. Hence 

 the student who uses the tables intelligently is sure to learn a vast 

 deal in regard to minerals, especially on the chemical side. Their 

 value is much increased by the fact that in the case of most 

 species the author has personally verified the reactions described. 



For nearly twenty years this admirable work has held a place 

 of its own and has played a highly important part in scientific 

 education. In its new form, with the changes and additions 

 which bring it into harmony with the science of the present time, 

 it cannot fail to be still more appreciated and to find even a wider 

 sphere of influence. 



7. The Law of Mines and Mining in the United States ; by 

 Daniel Moreau Barringer and Johx Stokes Adams. Pp. 

 cxxv and 878. Boston, 1897 (Little, Brown <fc Company). — All 

 those interested in the legal questions which are likely to arise in 

 regard to mining properties will appreciate the value of the 

 admirable and exhaustive treatment of the subject in the present 

 volume. It opens with a table of cases referred to through the 

 text; then follows an excellent geological preface designed to 

 make the non-scientific reader acquainted with the different types 

 of deposits and the conditions under which they occur. This is 

 abundantly illustrated by figures drawn from well-known authors. 

 The work proper is divided into twenty-five chapters, classified 

 according to the special subjects discussed. An appendix gives 



