Cytogenetic Studies in the Genus Allium. (With One hundred and four Text-figures and seven Diagrams) --
S. W. Mensinkai

The Effect of X-rays on Sex in Drosophila subobscura and an Account of some Sex-linked Characters. (With One Text-figure) --
A. L. M. Christie

The Inheritance and Linkage Relations of Yellow Seedling, a Lethal Gene in Asiatic Cotton --
Chi Pao Yu

The Inheritance and Linkage Relations of Curly leaf and Virescent Bud, two Mutants in Asiatic Cotton --
Chi Pao Yu

The Nature of Tetraploidy in Primula kewensis. (With Sixteen Text-figures) --
Margaret Upcott

The Genetical and mechanical Properties of the Sex Chromosomes. V. Cimex and the Heteroptera. (With Plates I-III and Eighteen Text-figures) --
C. D. Darlington

Studies on the Nature of the Interactions of the Genes Differentiating Quantitative Characters in a Cross between Lycopersicon esculentum and L. pimpinellifolium --
Leroy Powers

Tables of the Recombination fraction Estimated from the Product Ratio --
W. L. Stevens 171

Vol. 39, No. 2 (January, 1940)

A Radiation Method for Determining the Number of Genes in the X-Chromosome of Drosophila. (With Two Text-figures) --
D. E. Lea

Cytological Observations in Coffea. IV. (With Eighteen Text-figures) --
C. A. Krug and A. J. T. Mendes

The Determination of Position in Crossing-over. III. The Evidence of Metaphase Chiasmata. (With Thirteen Text-figures) --
K. Mather

Linkage Data on the Rex Character in the House Mouse --
F. A. E. Crew and Ch. Auerbach

An Experiment on Chromosome Fragmentation in Tradescantia by X-rays. (With Two Text-figures) --
A. C. Faberge

The Inheritance of Glume Shape in Triticum. (With Three Text-figures) --
A. E. Watkins

Gonosomic Mosaicism involving a Lethal --
A. R. Sidky

Spontaneous Inverted Exchange between X and Y in Drosophila melanogaster. (With Six Text-figures) --
F. A. E. Crew and Rowena Lamy

An Inherited Jaw Anomaly in Long-Haired Dachshunds. (With Plate IV and Six Text-figures) --
Hans Grüneberg and A. J. Lea

A Note on Pituitary Dwarfism in the Mouse. (With Two Text-figures) --
G. R. de Beer and Hans Grüneberg

Notes on the D-chromosome of the Sweet Pea. (With Two Text-figures). (With an Appendix by C. D. Darlington) --
R. C. Punnett

A Study of Chromosome Catenation in Oenothera Hybrids. (With Thirty Text-figures) --
S. M. Sikka

Genetic Studies in Poultry. X. Linkage Data for the Sex Chromosome --
R. C. Punnett

The Pathology of the Lungs in a Lethal Mutation in the Rat (Rattus norvegicus).
(With Four Text-figures) --
Stefan Engel and Hans Grüneberg

The Origin of Iso-Chromosomes. (With Plates V and VI and Fifteen Text-figures) --
C. D. Darlington

Genetical Studies on the first Reciprocal Translocation found in Pisum sativum. (With Plate VII) --
Caroline Pellew

An Analysis of Environmental and Genetic Factors Influencing Stomach-worm Infestation in Sheep. (With Three Text-figures) --
P. W. Gregory, R. F. Miller and M. A. Stewart

The Addition of Two Factor Pairs for Chlorophyll-deficient Seedlings to the Linkage Groups of Barley --
D. W. Robertson and O. H. Coleman

The “Extra-bristle” Complex in Drosophila melanogaster and its Reaction with Scute8. (With Eleven Text-figures) --
A. H. Sparrow and S. C. Reed

Studies in the Cytology of Cereals. (With Forty-four Text-figures) --
G. N. Pathak

Studies on Atypical Growth in Plants from a Cytogenetic Point of View. (With Plate VIII and One Text-figure) --
Dontcho Kostoff

The Endocrine System and Plumage Types. II. The Effects of Thyroxin Injections to Normal, Caponized and Thyroidectomized Caponized Birds. (With Plates IX and X) --
C. W. Emmens and A. S. Parkes

The Endocrine System and Plumage Types. III. Further Experiments on the Relation between the Thyroid Gland and Plumage Patterns in domestic Fowls and Ducks --
J. P. Chu

The Endocrine System and Plumage Types. IV. Ferminization of Plumage, with especial reference to Henny Cocks and Eclipse Drakes. (With plates XI-XIV) --
C. W. Emmens and A. S. Parkes

The Endocrine System and Plumage Types. V. The Production of Eclipse Plumage in the Mallard by Injection of Anterior Pituitary Extract and Dehydroandrosterone. (With One Text-figure) --
J. P. Chu