160 Scientific Intelligence. 



3. Wiedemann's Annalen, Jubelband. 436 pp. with index, 

 1897. — Following an earlier precedent, the fiftieth anniversary of 

 ihe doctorate of Gustav Wiedemann is now commemorated by 

 the publication of a special volume of the Annalen der Physik 

 und Cliemie; this forms vol. lxiii of the regular series. 



Like all the publications of this honored Journal it is crowded 

 with original matter of importance to physicists ; fifty-seven 

 articles are here included. The labors of Dr. Wiedemann, both 

 as author and editor, are well known, but it may be noted that a 

 few years since, on the publication of the fiftieth volume of Wiede- 

 mann's Annalen, a summary of his work was given by Hermann 

 von Helmholtz. 



4. Untersuchung uber die Bahn des Cometen, 1822, I~V ; von 

 Dr. Albert Siichenoth, pp. 64, quarto. Leipzig, 1897 (W. 

 Engelmann). — This comet, which was discovered by Pons and 

 observed for nearly four months at sixteen observatories, was inves- 

 tigated by Bessel with Besselian thoroughness. The present trea- 

 tise, which is among the most laboriously complete to be found in 

 comet literature, and admirably planned, introduces the small 

 effect of perturbations and is of interest as settling the question 

 of the eccentricity. BessePs eccentricity of 0*9963021 (period 

 5449 years) is wisely made the independent variable of the normal 

 differential equations and the effect on the normal equations of 9 

 values of e from 1-0 to 09943 determined. 



It is thus shown that the normal equations are satisfied within 

 reasonable limits of error by any period from 4504 to 8748 years, 

 but not by a parabola, w. b. 



5. Problems of Nature, researches and discoveries of Gustav 

 Jaeger, M.D., selected from his published writings; ed. and 

 transl. by Henry G. Schltchter, pp. 1-261. (Williams & 

 Norgate, London), 1897. — The book contains thirty-two chapters 

 on various topics, illustrating the views of a thoughtful, educated 

 physician on matters suggested by the investigations of Darwin 

 and others during the last fifty years. 



6. Verzeichniss sammtlicher Preparate, Drogenund Miner alien 

 rait Erlauterungen, 1897. — A new edition of the well-known 

 Merck catalogue of chemical preparations, drugs and minerals. 



OBITUARY. 



Dr. Albrecht Schrauf, Professor of Mineralogy at the Uni- 

 versity of Vienna and for many years Gustos in the Imperial 

 Museum, died in December last at the age of sixty years. He 

 was an active worker and profound thinker, the author of many 

 mineralogical memoirs and of several books, the most important, 

 his Lehrbuch der physikalischen Mineralogie (1868) and his Atlas 

 der Krystallformen (1865-1877) ; the last was never completed. 



