466 



SCIENCE 



[N. S. Vol. XLIX. No. 1272 



develojwd Tracts in the Siienandoali Valley, 

 Va.," by D. F. Hewitt, G. W. Stose, F. J. 

 Katz and H. D. Miser. The greensand de- 

 posits of the eastern United States are con- 

 sidered by Q H. Ashley particularly with 

 reference to their possible utilization as a 

 source of potash, for their green color is due 

 to their content of glauconite, a mineral that 

 usually carries about 7 per cent, of potash, 

 although the sands as a whole contain some- 

 what less of this useful alkali. An interest- 

 ing paper on " Strontianit Deposits near Bar- 

 stow, Cal.," by Adolph Knopf, forms part of 

 the Tolume. Strontianite has been success- 

 fully used in the recovery of sugar from beet- 

 sugar molasses, large quantities of the molasses 

 being unavoidably produced in the manufac- 

 ture of beet sugar. Among the mining dis- 

 tricts described in this bulletin are the Cuy- 

 una iron district, Minn., by E. C. Harder and 

 A. "W. Johnston; the Kings Mountain tin 

 district, 'N. 0. and S. C, by Arthur Keith and 

 D. B. Sterrett; the northwestern part of the 

 Garnet Range and the Dunklebery district, 

 Mont., by J. T. Pardee; and the Arabia dis- 

 trict, ISTev., by Adolph Knopf. 



The bulletin which consists of about 300 

 pages and contains a number of small maps 

 and line illustrations, may be obtained on ap- 

 plication to the Director, U. S. Geological 

 Survey, "Washington, D. C. 



SUMMER BIOLOGICAL STATIONS 



The University of Michigan will maintain 

 its biological station for instruction and re- 

 search for the eleventh session during the 

 eight weeks from June 30 to August 22. This 

 station is situated on the shores of Douglas 

 Lake, near Pellston, Mich., about twenty miles 

 northeast of Petoskey, in the famous summer 

 playground of northern Michigan. It is, how- 

 ever, well isolated from the summer resorts and 

 the resort crowds. The personnel of the teach- 

 ing staff is as follows: In zoology. Professors 

 La Rue and "Welch, of the University of Mich- 

 igan, Professor Frank Smith, of the Univer- 

 sity of Illinois, and Mr. Dayton Stoner, of the 

 State University of Iowa ; in botany. Professor 

 Gates and Dr. Ehlers, of the University of 



Michigan, and Professor Quick, of De Pauw 

 University. Courses are offered in entomol- 

 ogy, ornithology, vertebrate zoology, ecology of 

 invertebrate animals, systematic botany, plant 

 ecology and plant anatomy, all but the last re- 

 quiring a large amount of field work. Oppor- 

 tunity for investigation is offered to a limited 

 number of investigators upon payment of 

 nominal fees. For further information ad- 

 dress George R. La Rue, director, the Biolog- 

 ical Station, University of Michigan, Ann 

 Arbor. 



Dr. Raymond C. Osburn, head of the depart- 

 ment of zoology and entomology in Ohio State 

 University, has been appointed director of the 

 Lake Laboratory. The 1919 session of the 

 laboratory will be held from June 23 to 

 August 2, a period of six weeks. The lab- 

 oratory is now located at Put-in-Bay, Ohio, 

 which is on an island in Lake Erie several 

 miles from the mainland. It is easily reached 

 by steamer from Cleveland, Sandusky and 

 Detroit. Cooperation with the State Fish and 

 Game Commission of Ohio during the 1918 

 session proved satisfactory to both the lab- 

 oratory and the commission and the arrange- 

 ment will be continued. A course on the 

 iishes of Lake Erie will be given by Professor 

 Osburn. Members of the staff will be Dr. 

 F. H. Krecker, the acting director, Ohio State 

 University, who will offer a course in animal 

 ecology; Professor S. E. "Williams, of Miami 

 University, who is in charge of invertebrate 

 morphology; Professor M. E. Stickney, of 

 Denison University, who gives work in plant 

 ecology, and Dr. Edna Mosher, who is in 

 charge of entomology. Surveys made last 

 summer showed that the region was exception- 

 ally well suited to the requirements of the lab- 

 oratory. The fauna and flora are abundant 

 and offer a wide field for research along a 

 number of important lines. Independent 

 workers will be cordially welcomed and given 

 laboratory accoromodations without charge. 



An illustrated booklet has recently been 

 issued descriptive of the work and environ- 

 ment of the Iowa Lakeside Laboratory. This 

 station was founded by alumni of the Uni- 

 versity of Iowa on Lake Okoboji in 1909. 



