536 



SCIENCE 



[N. S. Vol. XXXI. No. 797 



Mosquitoes and their Allies," by Professor W. M. 

 Wheeler. 



April 24—" Mendel's Law of Heredity," by Pro- 

 fessor W. E. Castle. 



May 1— "Variation and Selection in Evolution 

 and in Animal Breeding," by Professor W. E. 

 Castle. 



May 8—" The Gypsy and Brown-tail Moths," 

 by Mr. C. T. Brues. 



May 15—" Insects Injurious to Elm Trees," by 

 Mr. C. T. Brues. 



May 22— "Making New Plants by Selection," 

 by Professor E. M. East. 



May 29— "Making New Plants by Hybridiza- 

 tion," by Professor E. M. East. 



The Eastern Branch of the American So- 

 ciety of Zoologists at its recent meeting in 

 Boston designated the following persons as a 

 committee to cooperate with the commission 

 on nomenclature of the International Zoolog- 

 ical Congress: Dr. H. B. Bigelow, Museum of 

 Comparative Zoology, of Harvard University, 

 chairman; Dr. A. Petrunkevitch, American 

 Museum of Natural History; Professor J. S. 

 Kingsley, Tufts College; Dr. A. G. Mayer, 

 Carnegie Institution of Washington; Dr. J. 

 P. Moore, Philadelphia Academy of Natural 

 Sciences. 



One of the field courses announced in the 

 Harvard Summer School is a physiographic 

 excursion to be conducted by Professor W. 

 M. Davis in the Eocky Mountains of Colorado 

 during three weeks in July, beginning at 

 Denver, July 6. The object of the trip is to 

 study various features of mountain form, with 

 special attention to the best method of de- 

 scribing them. The points to be visited are: 

 the normal and glacial features of the high- 

 lands and continental divide of the Front 

 range at the head of Boulder creek, crossed by 

 rail at an altitude of 11,680 feet; the foot 

 hiUs in the neighborhood of Golden and the 

 valley of Clear Creek; the foot hiUs in the 

 Garden of the Gods near Colorado Springs, 

 and the fault-line escarpment of the Front 

 range next to the south; the highlands west of 

 Colorado Springs, over which Pikes Peak rises 

 like a great monadnock; South Park, as an 

 example of a high-level interment basin; the 

 upper Arkansas valley, as an example of 



a deeper intermont basin; the normal 

 and glacial features of the Sawatch range 

 west of the Arkansas vaUey; the Eoyal 

 gorge of the Arkansas in the Front range, 

 and the foot hills near Canyon city; the lava- 

 capped Eaton mesa near Trinidad; and the 

 district of dike-walls on the denuded slopes 

 of the deeply dissected ancient volcanoes, 

 known as Spanish peaks. The conditions on 

 which students (men only) may join the 

 party can be learned on addressing Professor 

 Davis, at Cambridge, Mass. The party will 

 travel from place to place by train or wagon, 

 making short distances on foot, and stopping 

 in hotels over night with possibly one or two 

 nights in camp. 



Letters have been received at the Harvard 

 College Observatory from Professor E. B. 

 Frost, director of the Yerkes Observatory, 

 giving the following observations by Professor 

 Bernard: Comet a 1910 was observed March 

 12, 1910, at 16" 56"" central standard time, 

 in E. A. 22" 24" 39' and Dec. +15°37'.3 

 (1910.0). "The comet was of the ninth 

 magnitude, strongly condensed, possibly to a 

 very faint nucleus. No tail noticed." A 

 photograph of the same comet was obtained 

 at dawn on March 14. No tail was shown 

 on the plate with an exposure of nine minutes. 

 Photographs made with all three lenses of the 

 Bruce telescope, the exposure being 1" 50", 

 failed to show any trace of the comet reported 

 by Pidoux. These plates show a tail to Hal- 

 ley's comet nearly a degree long. A photo- 

 graph of Comet a 1910 at dawn on the morn- 

 ing of March 15, the exposure being 35", 

 shows a faint tail two degrees long. 



The North Dakota Geological Survey has 

 recently published the fifth volume of its 

 series of reports dealing with the geology and 

 natural resources of the state. The present 

 report, which is a volume of 278 pages, with 

 many illustrations and maps, contains papers 

 on the geology, topography and coal deposits 

 of southwestern North Dakota, including the 

 Little Missouri badlands; the geology of the 

 northeastern portion of the state with partic- 

 ular reference to the natural cement rock of 

 that region; together with chapters on the 



