470 Scientific Intelligence. 



nous species of the genus Ascidia. Nearly all these forms are 

 illustrated by beautiful colored drawings by the authors. There 

 are also many anatomical figures. w. r. c. 



5. Catalogus Jfammalium tarn viventium quam fossilium a 

 Doctore E. L. Troitessart. Quinquennale Supplementum (1899- 

 1904) Fasciculus IV. Pp. vii, 753-929, Berlin, 1905 (R. Fried- 

 lander & Sohn). — This part completes the Supplement begun in 

 1904 (this Journal, xviii, 95) and gives the volume contents and 

 index. It includes the Cetacea, Edentata, Marsupialia, Allo- 

 theria, Monotremata. 



6. Carnegie Institution of. Washington. — Recent publica- 

 tions, not before announced, are as follows : 



' No. 9. — The Collected Mathematical Works of George 

 William Hill. Volume one. Pp. xviii, 363. With an intro- 

 duction by M. H. Poincare and a portrait (frontispiece). 



No. 35. — Investigations of Infra-red Spectra. Part I, Infra- 

 red Absorption Spectra ; Part II, Infra-red Emission Spectra ; by 

 William W. Coblentz. 331 pp., 152 figures, 3 folded plates. 



No. 36. — Studies in Spermatogenesis, with especial reference to 

 the " Accessory Chromosome " ; by N. M. Stevens. 30 pp., 7 

 plates. 



No. 37. — Sexual Reproduction and the Organization of the 

 Nucleus in certain Mildews ; by R. A. Harper. 104 pp., 7 

 plates. 



No. 41. — Traditions of the Caddo, collected under the auspices 

 of the Carnegie Institution of Washington ; by George A. Dor- 

 se y. 136 pp. 



7. A Handbook of the Trees of California ; by Alice East- 

 wood, Curator of the Department of Botany. Occasional Papers 

 of the California Academy of Sciences, IX. 86 pp., 57 plates. 

 San Francisco, 1905. — The scope of this work will be seen from 

 the following statement quoted from the preface : " The aim has 

 been to prepare a work which, while giving all the information 

 necessary for the identification of the different trees of our val- 

 leys and mountains, will be so brief and concise that the entire 

 matter can be put into a book that can be carried into the field." 

 The description of species are quite brief, but are well supple- 

 mented by a series of 57 excellent plates. 



Obituary. 



Professor Dewitt Bristol Brace, head of the Department 

 of Physics in the University of Nebraska and author of numerous 

 physical papers, died at his home in Lincoln, Nebraska, on Octo- 

 ber 2, in his forty-seventh year. 



Professor Ralph Copeland, Astronomer Royal of Scotland 

 and Professor of Astronomy in the University of Edinburgh, 

 died on October 27, at the age of sixty-eight years. 



Dr. W. von Bezold, Professor of Physics and Meteorology 

 at the University of Berlin and Director of the German Meteoro- 

 logical Institute, died early in October, in his sixty-ninth year. 



