514 



SCIENCE 



[N. S. Vol. LII. No. 1352 



G. N. Collins, Bureau of Plant Industry, Washing- 

 ton, D. C. 



J. A. Detlefsen, assistant professor of genetics, 

 University of Illinois. 



R. A. Emerson, professor of plant breeding, Cor- 

 nell University. 



H. D. Goodale, biologist, department of poultry 

 husbandry, Massachusetts Agricultural College. 



John W. Gowen, biologist, Maine Agricultural Ex- 

 periment Station. 



H. K. Hayes, professor of plant breeding. Univer- 

 sity of Minnesota. 



D. F. Jones, department of plant breeding, Con- 

 necticut Agricultural Experiment Station. 



William A. Lippincott, professor of poultry hus- 

 bandry, Kansas State Agricultural College. 



Edward N. Wentworth, Armour's Bureau of Agri- 

 cultural Research and Economies, Union Stock 

 Yards, Chicago. 



Sewall Wright, senior animal husbandman. Bureau 

 of Animal Industry, Washington, D. C. 



DOCTORATES CONFERRED IN THE 

 SCIENCES BY AMERICAN UNI- 

 VERSITIES IN 1920. II 



ENGINEERING 



Columbia: Mortimer Thomas Harvey, "Bakelite 

 intermediates. ' ' Erank Abraham Struss, ' ' Ben- 

 zoic acid from benzine. ' ' 



George Washington: Alanson David Morehouse, 

 "Rainfall and run-off and the hydraulics of 

 drainage ditches. ' ' 



Johns Hopkins: Frederick William Lee, "Elec- 

 tric strength of air under continuous potentials 

 and as influenced by temperature." 



Wisconsin: Harold Marion Crothers, "Selective 

 properties of coupled radio circuits. ' ' 



geography 



Harvard: Roderick Peattie, "Geographic condi- 

 tions of the lower St. Lawrence Valley. ' ' 



Wisconsin: Leonard Bayliss Krueger, Title of 

 thesis not given. Selma Langenhan Schubring, 

 "A statistical study of lead and zinc mining in 

 Wisconsin. ' ' 



Geology 



California: Nicholas Lloyd Taliaferro, "Manga- 

 nese deposits of the Sierra Nevada of Cali- 

 fornia." Frank Samuel Hudson, "Geology of 

 the Cuyamaca region, California, with special 

 reference to the origin of the nickeliferous 

 pyrrhotite. ' ' 



Chicago: Paul MacClintock, "Pleistocene history 

 of the lower Wisconsin Valley." Bertram Reid 

 MacKay, ' ' Geology -and physiography of the 

 BeaueeviUe map area, Quebec, with special ref- 

 erence to placer gold deposits." Horace Noble 

 CoryeU, "Bryozoon fauna of the Stones River 

 formation of central Tennessee." Ralph Works 

 Chaney, "Flora of the Eagle Creek Forma- 

 tion. ' ' 



Illinois: Clarence Samuel Ross, "Differentiation 

 and contact metamorphism of the Snowbank 

 syenite in the Vermillion iron bearing region of 

 Minnesota." Luther Eugene Kennedy, "Caca- 

 quabie granite and porphyry and their contact 

 effects. ' ' 



Massachusetts: George Hanson, "Some Canadian 

 occurrences of pyiitic deposits in metamorphic 

 rocks. ' ' 



Minnesota: Arthur Jerrold Teije, "Cambrian 

 sedimentation in the Big Horn Mountains." 



Princeton: Benjamin Franklin Howell, "Cam- 

 brian paradoxides beds at Manuels, Newfound- 

 land. ' ' 



Yale: William Sidney McCann, "Geology and 

 mineral deposits of the Bridge River map-area, 

 British Columbia. ' ' Chester Ray Longwell, 

 "Geology of the Muddy Mountains, Nev., with 

 a section to the Grand Wash Cliffs in Arizona. ' ' 

 George Sherwood Hume, ' ' Stratigraphy and 

 geologic relations of the Paleozoic outlier of 

 Lake Timiskaming, Ontario." Kirk Bryan, 

 ' ' Geology, physiography, and water resources of 

 the Papago Country, Arizona." Walter Andrew 

 Bell, "Stratigraphy of the Horton-Windsor 

 District, Nova Scotia." 



mathematics 



Bryn Mawr: Bird Margaret Turner, "Plane 

 cubics with a given quadrangle of inflexion." 



California: Elsie Jeanette MeFarland, "On a 

 special quartic curve." 



Chicago: Cyril Arthur Nelson, "Conjugate sys- 

 tems with conjugate axis curves." Gladys Eliza- 

 beth Carson Gibbens, ' ' Comparison of different 

 line-geometric representations for functions of 

 a complex variable." John Wayne Lasley, Jr., 

 ' ' Some special cases of the fleenode transforma- 

 tion of ruled surfaces." William Lloyd Garri- 

 son Williams, "Fundamental systems of formal 

 modular seminvariants of the binary cubic." 



Columbia : Emil L. Post, ' ' Introduction to a gen- 

 eral theory of elementary propositions. ' ' 



Cornell: George Merritt Robinson, "Divergent 

 double sequences and series." 



