Geology and Mineralogy. 153 



object in view. The list of species included is long, since, out- 

 side of those which are involved as primary rock constituents, 

 many others are important either as accessories, as special devel- 

 opments in particular cases, or as due to alteration and secondary 

 action. The work as a whole can be very highly commended 

 and will doubtless be appreciated at its full value. 



14. Das Salz : Dessen Vorkommen und Verwertuny in Sdmt- 

 lichen Staaten der Erde / verfasst von J. Ottokar Freiherrn 

 von Buschman. II Band. Asien, Afrika, Amerika und Austra- 

 lien mit Ozeanien. Pp. 506. Leipzig; 1906 (W. Engelmann). 

 Herausgegeben mit Untersttitzung der Kaiserlichen Akademie 

 der Wissenschafteu in Wien aus der Treitl-Stiftung. — The first 

 volume of this extensive work, which is devoted to occurrences 

 of salt in Europe, is stated to be in press ; the second volume, 

 now issued, covers the remainder of the world. It gives a very 

 full statement of the occurrence of salt at the different localities 

 from which it is obtained in quantit}^ with data in regard to the 

 amounts and values. The first two hundred pages are devoted 

 to Asia, beginning with China and going on through India, 

 Japan, etc., to Arabia. Then follows Africa and finally America, 

 with a brief treatment of Australia and Oceanica. Under each the 

 special localities of salt are first discussed, then follow statements 

 as to the amount of import and export with their values, and finally 

 the amount consumed in the country. , A concise bibliography is 

 introduced before each general division, adding completeness to 

 a work which is already full of detail. 



15. Chemische Krystalloyraphie ; von P. Groth. ErsterTeil. 

 Pp. v, 626, with 389 figures! Leipzig, 1906 (Wilhelm Engel- 

 mann). — The long promised Chemical Crystallography by Pro- 

 fessor Groth has finally taken material form, — a fact which is of 

 the greatest interest alike to chemists as well as to mineralogists 

 and crystallographers. For many years the works of Rammels- 

 berg were the ones which were constantly referred to for data in 

 regard to the crystallization of chemical compounds. Since they 

 appeared, however, a quarter-century has passed, and a vast 

 series of new facts and observations have accumulated ; what is 

 more important, also, the whole standpoint in regard to the 

 theory of crystalline structure, and the relation between the 

 chemical composition of compounds and their physical proper- 

 ties, has been developed. It is to this latter part of the subject 

 that the author of the present work has made the most impor- 

 tant contributions, and his works have done much to broaden the 

 point of view of all the workers in this line. His Chemical 

 Crystallography, therefore, while giving an almost bewildering 

 amount of inlormation in regard to chemical compounds, is much 

 more than a m< j re compilation of crystallographic and physical 

 data. The fundamental principles alluded to above form the 

 basis of the whole, and the discussions which introduce each 

 group of compounds are most illuminating. 



This first part, now issued, includes the elements and the inor- 

 ganic compounds outside of the salts, the simple and complex 



