330 Scientific Intelligence. 



the water, etc., are well brought out, as well as the soft creamy 

 tints of the old stone residence at Walsingham, and the neutral 

 gray of the rocks. Three other plates were copied from water- 

 color drawings of groups of bright-colored Bermuda fishes, made 

 from life by Mr. Verrill. The photographic reproductions of 

 these drawings showed accurately all the tints and delicate 

 shades of green, blue, pink, purple, yellow, and orange, beauti- 

 fully blended. The colors in these pictures are peculiarly soft 

 and natural, without the stiffness of the three-color process. The 

 bright red colors appear to be the most difficult to render by this 

 process, at present, but no doubt this will soon be remedied by 

 further experiments now in progress. The photographs are on 

 paper and are made by a purely photo-chemical process. 



The process is certain to be of great value for photographing 

 the colors of Natural History specimens and for reproducing 

 paintings, but is not adapted for portrait work owing to the 

 length of exposure required for the negatives. a. e. v. 



3. Lehrbuch der Meteorologie ; von Dr. Julius Hann, Pro- 

 fessor an der Universitat in Wien. Pp. 805, 111 figs., 8 pi., 

 15 maps. Leipzig, 1901 (Tauchnitz). — This admirable volume 

 belongs to the highest class of scientific treatises. Its author is 

 the leading meteorologist of the world, for many years director 

 of the meteorological observatory at Vienna and for a still longer 

 time editor of the Meteorologische Zeitschrift. He is the author 

 of several smaller books, his Klimatologie being the chief of 

 these, of many scientific memoirs, and of a host of shorter 

 articles. His breadth of knowledge is shown by the complete- 

 ness with which the pages of this new treatise make reference 

 to original sources; his competence by the thoroughness with 

 which every part of the subject is presented. Like Bartholo- 

 mew's Atlas of Meteorology (the first published part of a pro- 

 jected physical atlas), which took highest rank on its appearance 

 three years ago, Hann's Lehrbuch is indispensable to every well 

 equipped scientific library and to every advanced worker in the 

 science of the atmosphere. w. m. d. 



4. The American Philosophical Society. — The general meeting 

 of the Society will be held at Philadelphia, April 3d, 4th and 5th, 

 1902. The preliminary program gives a list of thirty papers 

 covering a wide field of scientific subjects. See further, p. 400, 

 Nov., 1901. 



5. A JVeio Theory of Evolution ; by Alfred Ward Smith. 

 The Abbey Press, New York. Pp. 1-256.— The author of this 

 book believes that Economy, Efficiency and Harmony are pri- 

 mary and essential traits of universal progress and ought to be 

 embodied in the theory and formula of evolution. 



Obituary. 

 Albert Ripley Leeds, for many years Professor of Chem- 

 istry at the Stevens Institute in Hoboken, N. J., died on 

 March 13. 





