Genetic Studies in Poultry. XI. The Legbar. (With Plate 1 and Two Text-figures) – R. C. Punnett

The Causal Sequence of Meiosis. I. Chiasma Formation and the order of Pairing in Fritillaria. (With Twenty-seven Text-figures) – O. H. Frankel

The Causal Sequence of Meiosis. II. Contact Points and Crossing-over Potential in a Triploid Fritillaria. (With Four Text-figures) – C. D. Darlington

The Causal Sequence of Meiosis. III. The Effect of Hybridity on Male and Female Cells in Lilium. (With Eighteen Text-figures) – C. D. Darlington and L. La Cour

The Genetics of Verbana. II. Chemistry of the Flower Colour Variations – G. H. Beale, J. R. Price and R. Scott-Moncrieff (Mrs Meares)

The Genetic Control of Wing Development in Drosophila. (With Plates 2–5 and Fifteen Text-figures) – C. H. Waddington

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114-139

The Partial Sex-Linkage of Recessive Spastic Paraplegia – J. B. S. Haldane

The Relative Importance of Principal and Modifying Genes in Determining some Human Diseases. (With One Text-figure) – J. B. S. Haldane

Variation and Selection of Polygenic Characters. (With Plate 6 and Ten Text-figures) – K. Mather

The Induction of Chromosome Losses in Drosophila Sperm and their Linear Dependence on Dosages of Irradiation. (With One Text-figure) – Dr G. Pontecorvo

Intergeneric Hybrids of Saccharum. (With Twenty-two Text-figures) – E. K. Janaki-Ammal

The Effect of Sex on the Spontaneous Mutation Rate in Drosophila melanogaster – Charlotte Auerbach

"Pigtail," a Hereditary Tail Abnormality in the House Mouse, Mus musculus. (With Plates 7 and 8 and Two Text-figures) – F. A. E. Crew and Charlotte Auerbach

The Activity of Inert Chromosomes in Zea Mays. (With Plate 9 and Eleven Text-figures) – C. D. Darlington and M. B. Upcott

Spontaneous Chromosome Change. (With Plate 10 and Twenty-three Text-figures) – C. D. Darlington and M. B. Upcott

The Gentics of Auilegia vulgaris – Brenhilda Schafer

The Sex-Determining Mechanism of the Earwig, Forficula auricularia. (With Plates 11–13 and Twelve Text-figures) – H. G. Callan

The Gentical and Mechanical Properties of the Sex Chromosomes. VII. Apodemus sylvaticus and A. hebridensis. (With Nine Text-figures) – P. C. Koller

The Genetics of Blackarm Resistance. II. Classification, on their Resistance, of Cotton Types and Strains. III. Inheritance in Crosses within the Gossypium hirsutum Group. (With Three Text-figures) – R. L. Knight and T. W. Clouston

Meiosis in Diptera. I. Prophase Associations of Non-Homologous Chromosomes, and their Relation to Mutual Attraction between Centromeres, Centrosomes and Chromosome Ends. (With Plate 14 and Twenty-five Text-figures) – C. Ronald Ribbands