312 Scientific Intelligence. 



16. Snow Crystals. — A recent paper by G. Nordenskiold gives 

 the preliminary results of an investigation in the winter of 

 1892-93 of the forms of snow crystals. The discussion of gen- 

 eral conclusions is deferred for a later article, but the results as 

 given show a much higher degree of complex character than has 

 ordinarily been assumed. The crystals are divided into two 

 groups according as the development is in the direction of the 

 vertical axis or tabular, and several varieties are noted under each. 

 The paper is illustrated by 20 excellent photo-plates showing 

 many types of forms ; most of the crystals are magnified several 

 diameters. — Geol. For. Forh.,xv, 146, 1893, and Bull. Soc. Min., 

 xvi, 59. 



17. Repertorium der mineralogischen und krystallographischen 

 Liter atur von An fang d. J. 1885, bis An fang d. J. 1891 ; 

 und Generalregister der Zeitschrift fur Krystallographie und 

 Mineralogie, Band xi-xx. Herausgegeben und bearbeitet von 

 P. Groth und F. Grlnling. II Theil. 287 pp. 8vo. Leipzig, 

 1893 ( W. Engelmann). — The second part of this important work 

 (see this Journal, May, 1893, p. 442) has recently been issued. 

 It contains the topical index by Dr. Griinling to volumes xi to 

 xx of Groth's Zeitschrift fur Krystallographie und Mineralogie. 



III. Miscellaneous Scientific Intelligence. 



1. American Association for the Advancement of Science. — 

 The forty-second meeting of the American Association was held 

 at Madison, Wisconsin, from the 16th to the 22d of August; 

 about three hundred members registered. The President of 

 the meeting was Prof. William Harkness of Washington. The 

 Vice-Presidents, with the subjects of the addresses delivered by 

 them before their respective sections, are as follows : 



A, Mathematics and Astronomy— C. L. Doolittle, of South 



Bethlehem, Pa., on Variations of Latitude. 



B, Physics — E. L. Nichols, of Ithaca, N. Y., on Phenomena of 



the Time Infinitesimal. 



C, Chemistry — Edward Hart, of Easton, Pa., on Twenty-five 



Years' Progress in Analytical Chemistry. 



D, Mechanical Science and Engineering — S. W. Robinson, 



of Columbus, Ohio, on Recent Advances in Mechanical 

 Science. 



E, Geology and Geography — Chas. D. Walcott, of Washing- 



ton, D. C, on Geologic Time as Indicated by the Sedimen- 

 tary Rocks of North America. 



F, Zoology — Henry F. Osborn, of New York, N. Y., on The 



Rise of the Mammalia. 



G, Botany — Charles E. Bessey, of Lincoln, Neb., on Evolution 



and Classification. 

 H, Anthropology — J. Owen Dorsey, of Tacoma Park, Md., on 

 the Biloxi Indians of Louisiana. 



