460 Scientific Intelligence. 



hand from the teacher and investigator, and nowhere does one find 

 the vagaries of indiscriminate compilation, which are an all too 

 common fault in books of this character. The tables are those of 

 the former edition, but a revision of them also is promised for the 

 near future. l. v. p. 



6. Mikroskopische Physiographie der inassigen Gesteine von 

 H. RosENBUscii. 3d ed. enlarged and revised, 8vo, second 

 half, pp. 553-1360. Stuttgart 1896. — The appearance of the new 

 edition of this well known work has already been noticed in this 

 Journal (vol. i, p. 63, 1896) ; the issuance of the second part com- 

 pletes it. The present part contains the effusive rocks, in which 

 the age distinction in classification is retained. The later rocks are, 

 however, described first as being the most typical, and it is clear 

 that the author does not attach the importance to age that the 

 separation in the book would seem to imply. The important 

 grouj) of diabases are described in this part. New matter has 

 been everywhere added and the subject dealt with critically to 

 date. The excellent indices are especially to be commended, 

 greatly aiding as they do in ready reference. It is to be 

 regretted that the size of the volume necessitated the omission of 

 the general index to the literature, which was so serviceable a 

 feature of the previous editions. l. v. p. 



7. Die Minerale des Ilarzes, eine auf fremden und eigenen 

 Beobachtungen beruhende Zusammenstellung der von unserem 

 heimischen Gebirge bekannt gewordenen Minerale und Gestein- 

 sarten von Dr. Otto Luedecke. 643 pp. with an altas. Berlin, 

 1896 (Gebruder Borntraeger). — The mining region of the Harz 

 Mountains in Germany is one that has long been classical in the 

 study of mineralogy, remarkable both for the number of the 

 species it has afforded and for the perfection in which many of 

 them have been found. The author states that he has devoted 

 himself to the study of this region since 1880, and in addition to 

 his own extensive collections he has had the use of a number of 

 other collections, public and private ; the material at his disposal 

 has thus been very large. The results of his labors, in part 

 previously published, are given in this large volume. To his 

 own observations he adds also a summary of the earlier literature 

 and of the work of other mineralogists, and the volume thus 

 becomes a complete monograph of a series of most important 

 mineral localities. The species are arranged according to the 

 usual chemical classification and under each is given a minute 

 account of its crystallization, method of occurrence and association 

 with other species. In special cases, as for example with galena 

 and chalcopyrite, the feldspars, etc., a more minute geological 

 description is given of the particular regions involved, as also of 

 the associated rocks. 



The thoroughness with which the author has performed his 

 work, and the admirable way in which the whole is presented, 

 makes the volume one of very great value. A series of some 

 twenty-seven plates give figures of notable species, with spher- 



