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SCIENCE 



[N. S. Vol. XLI. No. 1054 



the University of Tiibingen, with the inten- 

 tion of qualifying himself for instruction. 

 When this course was completed, he became 

 an instructor, successively, in several Real- 

 schulen in Wurtemberg. His services in this 

 capacity were so highly appreciated that the 

 government sent him to Paris in 1867 to per- 

 fect himself in the French language. 



However, his growing interest in mineralogy 

 and geology gradually induced him to devote 

 more and more of his time to these studies, 

 and the doctor's degree was awarded him by 

 Tubingen University for a dissertation en- 

 titled : " Die Braunsteingange von Neuenberg." 

 Another period of study in Tiibingen in 1868 

 enabled him to profit by the instruction of 

 Professor Eduard Eeusch, an authority on 

 crystallography, and for a time Dr. Bauer con- 

 fined himself essentially to this science, while 

 not neglecting geology and ' paleontology. 

 Some of the results of his crystallographic in- 

 vestigations were presented in his first treatise, 

 on mica, issued in 1869, while a number of 

 articles on geology and paleontology as well 

 as his participation for a score of years in the 

 preparation of the special geological map of 

 Prussia, on a scale of 1 : 25,000, showed his 

 proficiency in these sciences. 



The autumn of 1868 found Dr. Bauer in 

 Berlin pursuing a course of study in the 

 mineralogical institute there under the direc- 

 tion of Gustav Eose. The outbreak of the 

 Franco-Prussian War in July, 1870, inter- 

 rupted these studies, as Dr. Bauer volunteered 

 in defence of his Fatherland. After the ter- 

 mination of this war he was active for a 

 time in Munich and then again in Tiibingen, 

 proceeding thence to Gottingen, where he be- 

 came privat decent of mineralogy and geology. 

 In 1872 he occupied a similar position in Berlin 

 University, also becoming first assistant in the 

 mineralogical institute. From Berlin, in 1875, 

 he was called to the University of Konigsberg 

 as ordinary professor of mineralogy and geol- 

 ogy. These studies had for a time been some- 

 what neglected in this university, and there 

 was a sad lack of instruments, books and 

 specimens; not a single fossil was to be seen. 

 This condition of things was entirely changed 

 by Professor Bauer during the one and a half 



years of his stay. While his lectures embraced 

 the entire field of mineralogy, geology and 

 paleontology, his own personal studies were 

 especially concerned with crystallography and 

 crystallographico-physieal investigations. It 

 was toward the close of this residence in 

 Konigsberg that he issued his " Lehrhuch der 

 Mineralogie" (1st ed., 1886; 2d ed., 1904). 



In the autumn of 1884 Professor Bauer 

 transferred his activities to the University of 

 Marburg, where he has been professor of min- 

 eralogy and petrography for the past thirty 

 years. During this period he has devoted spe- 

 cial attention to the diabases of Hesse and 

 Nassau and to the basaltic region of Hesse, 

 formations which theretofore had been little 

 studied. 



At the time of Professor Bauer's removal 

 to Marburg, he succeeded to C. Klein as editor 

 of the mineralogical section of the Neues 

 Jahrbuch fur Mineralogie, Geologie und Pald- 

 ontologie and has carried on this task up to 

 the present time. During this long period 

 more than fifty regular volumes of the 

 Jahriuch and thirty-eight supplementary 

 volumes have been issued, and also more than 

 a dozen volumes of the Oentralhlatt fur 

 Mineralogie, Geologie und Paldontologie, a 

 publication connected with the Jahrhuch, 

 so that the editorial supervision of Professor 

 Bauer has covered some one hundred volumes 

 of these journals. 



The valuable researches and publications of 

 Professor Bauer on precious stones also belong 

 to this period, visits to the famous gem-cutting 

 establishments of Idar-Oberstein and to the 

 diamond-cutters of Hanau having aroused his 

 interest in this direction. A more definite 

 direction to his activity was, however, provided 

 by the plan of a German publishing house to 

 bring out a translation of the present writer's 

 " Gems and Precious Stones of North Amer- 

 ica." The task of translating and adapting 

 this book was entrusted to Professor Bauer. 

 As the publishers wished to enlarge the scope 

 of the work while retaining its rich embellish- 

 ment of colored plates, the enterprise resulted 

 in the production of the " Edelsteinkunde'" 

 (1st ed., 1896; 2d ed., 1909), an English ver- 

 sion of which was published by Dr. L. F. 



