Contents

	Front Matter
	Meeting History / Description	1
	Minutes of Plenary Sessions	15
	Meeting Participants	20
	Group Portrait
	Meeting Program	50
	Exhibits	68
	Excursions and Entertainments	74
	Group Conferences	75
	Transportation, Tours, and Lectures	76
	Treasurer's Report	79
	Welcoming Comments (Wilson, Mann, Goldschmidt)	81
	T. H. Morgan,       The Rise of Genetics	87
	A. F. Blakeslee,       The Species Problem in Datura	104
	F. A. E. Crew,       Inheritance of Educability	121
	C. B. Davenport,       Mendelism in Man	135
	R. A. Emerson,       The Present Status of Maize Genetics	141
	H. Federly,       The Conjugation of the Chromosomes	153
	R. A. Fisher,       The Evolutionary Modification of Genetic Phenomena	165
	R. Goldschmidt,       Genetik der Geographischen Variation	173
	J. B. S. Haldane,       Can Evolution be Explained in Terms of Known Genetical Facts?	185
	O. Mohr,       On the Potency of Mutant Genes and Wild-type Allelomorphs	190
	H. J. Muller,       Further Studies on the Nature and Causes of Gene Mutations	213
	K. Sax,       The Cytological Mechanism for Crossing Over	256
	L. J. Stadler,       On the Genetic Nature of Induced Mutations in Plants	274
	C. Stern,       Neuere Ergebnisse uber die Genetik und Zytologie des Crossing Over	295
	A. H. Sturtevant,       The Use of Mosaics in the Study of the Developmental Effects of Genes	304
	N. W. Timofeef-Ressovsky,       Mutations of the Gene in Different Directions	308
	N. I. Vavilov,       The Process of Evolution on Cultivated Plants	331
	O. Winge,       The Nature of Sex Chromosomes	343
	S. Wright,       The Roles of Mutation. Inbreeding, Crossbreeding, anfd Selection in Evolution	356
	Appendix (short reports and exhibits)	367