450 



SCIENCE 



[N. S. Vol. XLVII. No. 1219 



Synthesis .... 



No. 140. Silverware . 



No. 141. Insecticides 



No. 142. By-products 

 covery 



No. 143. Coke 



No. 144. Fertilizer . . 



No. 145. Soap 



No. 146. Glue 



No. 147. Distillation 



No. 148. Tobacco . . . 



No. 149. Laundry .. . 



H. A. Morton (Ph.D., University 6£ Pittsburgh), 



Senior Fellow. 

 C. J. Herrly (B.S., Pennsylvania State College). 

 H. E. Peck (B.S., Clarkson Memorial College of 



Technology) . 

 O. F. Hedenburg (Ph.D., University of Chicago). 



Ee- 



Walther Eiddle (Ph.D., University of Heidelberg). 



F. W. Sperr, Jr. (B.A., Ohio State University) , 



Advisory Fellow. 



Marc Darrin (M.S., University of Washington). 



O. O. MaUeis (M.S., University of Kansas). 



L. R. Oface (B.8., Ohio State University). 

 H. H. Meyers (B.S., University of Pennsylvania). 



(Fellow to be appointed.) 



E. H. Bogue (M.S., Massachusetts Agricultural 



College). 

 David Drogiu (B.A., College of the City of New 



York). 

 H. F. Perkins. 

 W. B. Pattison (M.A., University of Nebraska). 



...H. G. Elledge (M.S., University of Pittsburgh), 

 Senior Fellow. 

 K. E. Beach (A.B., Southwestern College). 



$5,000 a year. Bonus: 

 $5,000. January 1, 1919. 



$2,500 a year. December 



11, 1918. 

 $3,000 a year. January 1, 



1919. 



$3,000 a year. January 1, 



1919. 

 $7,000 a year. January 1, 



1919. 



$3,000 a year. Bonus: 



$5,000. January 5, 1919. 

 $2,000 a year. January 5, 



1919. 

 $2,500 a year. January 



5, 1919. 

 $5,300 a year. January 



18, 1919. 



$2,100 a year. Bonus: 

 $2,000. February 1, 

 1919. 



$5,000 a year. February 

 15, 1919. 



It required the cataclysm of the Great War 

 to bring men to realize fully the part v^hich 

 applied science is playing and, more particu- 

 larly, will play in the life of nations. As men 

 have come to knovs' that everything in modem 

 warfare is controlled in a large measure by 

 science — no gun of large caliber is located or 

 fired without its aid — so they have come to 

 know that in the making of things — in the 

 economy and progress of manufacturing opera- 

 tions — science must have a place, an important 

 place too. With this idea in mind, institu- 

 tions of learning and industries in this coun- 

 try, but more especially abroad, are investiga- 

 ting and studying methods to bring about co- 

 operation between science and industry. The 

 Mellon Institute is proud that, while very 

 young, it has been a pioneer in the field. Its 

 principal claim to distinction, apart from its 

 contributions to specific industries, is based on 

 the service it has been able to render to other 

 institutions in demonstrating the practicability 

 of a system which brings together science and 

 industry for the development of a future and 

 more gracious civilization. 



The administration of the Mellon Institute 

 is now constituted as follows : 



Eaymond F. Bacon, Ph.D., Director (on leave of 

 absence) ; 



Edward E. "Weidlein, M.A., Associate Director and 

 Acting Director; 



E. Ward 'Tillotson, Jr., Ph.D., Assistant Director ; 



John O'Connor, Jr., M.A., Assistant Director; 



William A. Hamor, M.A., Assistant Director (on 

 leave of absence) ; 



David S. Pratt, Ph.D., Assistant Director; 



Martin A. Eosanoff, Sc.D., Head of the Depart- 

 ment of Eesearch in Pure Chemistry. 



E. R. Weidlein, 

 Acting Director 

 Mellon Institute op Industrial Besearch, 

 University op Pittsburgh, 

 March 1, 1918 



THE EFFECT OF CATTLE ON THE 

 EROSION OF CANON BOTTOMS 



To every explorer in the arid canon coun- 

 try of southern Colorado the steep-walled ar- 

 royo trenched in the center of the flat alluvium 

 bottom is a familiar sight. Its vertical banks 

 many times twenty or twenty-five feet high in 

 the soft crumbling soil are no mean impedi- 

 ment to travel and its sandy or stony bottom 

 is a source of constant anxiety to the 

 freighter. Every storm fills this miniature 



