The American Genetic Association 



President.David Fairchild Vice-President, W. E. Castle Secretary, Sewall Wright 



Treasurer, Boyd Taylor 



EDITORIAL BOARD 



C. E. LEIGHTY R. R. GRAVES GEO. M. DARROW 



WILSON POPENOE PAUL POPENOE 



Members of the Council are ex-officio members of the Editorial Board 

 Managing Editor: ROBERT C. COOK 

 Business Manager: MRS, F. D. LUMSDEN 



COUNCIL 



W. E. CASTLE, Professor of Zoology, Harvard University, and Research Associate of the 



Carnegie Institution of Washington. 

 LEON J. COLE, Professor of Genetics, University of Wisconsin, Madison, Wisconsin. 

 G. N. COLLINS, Botanist, U. S. Department of Agriculture, Washington, D. C. 

 O. F. COOK, Bionomist in Charge of Breeding Investigations, U. S. Department of Agriculture. 

 D.\VID FAIRCHILD, Agricultural Explorer in Charge, U. S. Department of Agriculture. 

 GILBERT GROSVENOR, President National Geographic Society, Washington, D. C. 

 T. H. KEARNEY, Physiologist in Charge of Drought-Resistant Plant Breeding Investigations, 



U. S. Department of Agriculture. 

 VERNON KELLOGG, Chairman, Division of Educational Relations, National Research 



Council, Washington, D. C. 

 J. H. KEMPTON, Bureau of Plant Industry, U. S. Department of Agriculture. 

 E. W. SHEETS, Acting Chief of Animal Husbandry Division, U. S. Department of Agriculture. 

 FREDERICK ADAMS WOODS, Lecturer on Biology, Massachusetts Institute of Technology. 

 SEWALL WRIGHT, Senior Husbandman in Animal Genetics, U. S. Department of Agriculture. 



ADVISORY COMMITTEE 



W. S. ANDERSON, Genetics Department, University of Kentucky, Lexington, Kentucky. 



E. B. BABCOCK, Genetics Department, University of California, Berkeley, California. 



E. A. BESSEY, Professor of Botany, Michigan Agricultural College, East Lansing, Michigan. 



A. F. BLAKESLEE, Plant Genetist, Carnegie Institution, Cold Spring Harbor, New York. 



J. K. BREITENBECHER, Professor of Zoology, University of Oklahoma, Norman, Oklahoma. 



W. E. BRYAN, Professor of Plant Breeding, University of Arizona, Tucson, Arizona. 



C. B. DAVENPORT, Director, Department of Genetics, Carnegie Institution of Washing^ton, 



Cold Spring Harbor, L. I., New York. 

 J. A. DETLEFSEN, Professor of Genetics, Wistar Institute, Philadelphia, Pennsylvania. 

 RUSSELL W. DUCK, Professor of Animal Husbandry, Syracuse University, Syracuse, New York. 



E. M. EAST, Professor of Plant Genetics, Bussey Inst, of Applied Biology, Boston, Massachusetts. 

 R. A. EMERSON, Professor of Plant Breeding, Cornell University, Ithaca, New York. 



C. P. GILLETTE, President, The Genetic Foundation, Fort Collins, Colorado. 

 FREDERICK O. GROVER, Professor of Botany, Oberlin College, Oberlin, Ohio. 



ROBERT T. HANCE, Professor of Zoology, North Dakota Agricultural College, North Dakota. 

 HARRISON R. HUNT, Professor of Biology, University of Mississippi, Oxford, Mississippi. 

 R. E. HUNT, Professor of Animal Husbandry, Virginia Polytechnic Institute, Blacksburg, 



Virginia. 

 H. S. JENNINGS, Professor of Zoology, Johns Hopkins University, Baltimore, Maryland. 



D. F. JONES, Plant Breeder, Connecticut Agricultural Experiment Station, New Haven, Conn. 



F. B. LINFIELD, Director, Montana Experiment Station, Bozeman, Montana. 



WM. A. LIPPINCOTT, Professor of Poultry Husbandry, Kansas State Agricultural College, 



Manhattan, Kansas. 

 C. C. LITTLE, President, University of Maine, Orono, Maine. 

 JAY L. LUSH, Animal Husbandman, Texas Agricultural Experiment Station, College Station, 



Texas. 

 H. H. NEWMAN, Professor of Zoology, University of Chicago, Chicago, Illinois. 

 T. S. PALMER, Expert in Game Conservation, U. S. Dept. of Agriculture, Washington, D. C. 

 MRS. CHARLES C. RUMSEY, Vi^eatley Hills, Westbury, Long Island. 

 THOMAS W. SALMON, Professor of Psychiatry, Columbia University, New York City. 

 JOHN M. SCOTT, Vice Director, Florida Agricultural Experiment Station, Gainesville, Florida. 

 JOHN W. SCOTT, Professor of Zoology, University of Wyoming, Laramie, Wyoming. 

 A. D. SHAMEL, Pomologist, U. S. Department of Agriculture, Riverside, California. 

 GEORGE H. SHULL, Professor of Biology, Princeton University, Princeton, New Jersey. 

 W. W. SMITH, Professor of Animal Husbandry, Purdue University, Lafayette, Indiana. 

 CHARLES R. STOCKARD, Professor of Anatomy, Cornell University, New York City. 

 A. B. STOUT, New York Botanial Gardens, Bronx, New York City. 

 W. T. SWINGLE, Plant Physiologist in Charge of Breeding Investigations, U. S. Department 



of Agriculture, Washington, D. C. 



E. L. TIIORNDIKE, Professor of Educational Psychology, Columbia University, New York City. 

 L. H. TOMHAVE, Head of Department of Animal Husbandry, Pennsylvania State College, 



State College, Pennsylvania. 

 H. E. WALTER, Associate Professor of Biology, Brown University, Providence, Rhode Island. 

 H. J. WEBBER, Director, Citrus Experiment Station, Riverside, California. 

 E. N. WENTWORTH. Armour's Bureau of Airj'! Research and Economics, Chicago, Illinois. 

 P. W. WHITING, Child Welfare Research Station, University of Iowa, Iowa City, Iowa. 

 JOHN A. WIDTSOE, 47 E. South Temple St., Salt Lake City, Utah. 



