Apr. 5-June 28, 1924 
Contents 
v 
Page 
The Resistance of Oat Varieties to Stem Rust. William W. Mackie and 
Ruth F. Allen (1 text figure; 2 plates)_ 705 
Indicator Significance of the Natural Vegetation of the Southwestern 
Desert Region. H. L. Shantz and R. L. Piemeisel (21 text figures; 
14 plates)_ 721 
Acromania, or “ Crazy-Top,” a Growth Disorder of Cotton. O. F. Cook 
(15 plates)_ 803 
The Polyembryonic Development of Platygaster vernalis. R. W. Leiby 
<md C. C. Hill (8 plates)_ 829 
The Inheritance of Pubescent Nodes in a Cross between Two Varieties of 
Wheat. H. H. Love and W. T. Craig_ 841 
Density of Cell Sap in Relation to Environmental Conditions in the 
Wasatch Mountains of Utah. C. F. Korstain (5 text figures)_ 845 
An Ascigerous Stage and Synonomy for Fusarium monttiforme. Grace 
O. Wineland (2 plates; 6 text figures)_ 909 
Expulsion of Aecidiospores by the May apple Rust, Puccinia podophylli 
Schw. B. O. Dodge (1 plate; 1 text figure)_ 923 
The Heat of Wetting of Soil Colloids. M. S. Anderson_ 927 
Comparison of Pima Cotton with Upland Varieties in Arizona. C. J. King, 
H. F. Loomis, and D. L. Varmette (3 plates; 4 text figures)_ 937 
The Fungus Causing the Common Brown Rot of Fruits in America. John 
W. Roberts and John C. Dtjnegan (2 plates)- 955 
Preliminary Results with the Borax Treatment of Citrus Fruits for the 
Prevention of Blue Mold Rot. Harry R. Fulton and John J. Bow¬ 
man (5 text figures)___ 961 
Snails as Predisposing Agents of Sugar Cane “Root Disease” in Louisiana. 
R. D. Rands___ 969 
Greenhouse Experiments with Atmospheric Nitrogen Fertilizers and 
Related Compounds. F. E. Allison, E. B. Vliet, J. J. Skinner, and 
F. R. Reid (1 plate)_ 971 
Individual and Age Variation in Microtus montanus yosemite. A. Brazier 
Howell (1 plate; 25 text figures)_--- 977 
A Genetic and Cytological Study of Certain Hybrids of Wheat Species. 
Karl Sax and E. F. Gaines (2 plates)- 1017 
Determination of Temperatures Fatal to the Powder-Post Beetle, Lyctus 
planicollis Leconte, by Steaming Infested Ash and Oak Lumber in a 
Kiln. T. E. Snyder and R. A. St. George (1 plate)- 1033 
Bacterial Blight of Rve. C. S. Reddy, James Godkin, and A. G. Johnson 
(1 plate)..-_J_ 1039 
Non-Inheritance of Terminal Bud Abortion in Pima Cotton. Thomas 
H. Kearney (1 plate)___ — _-- 1041 
Relative Resistance of the Rice Weevil, Sitophilus oryza L ., and the 
Granary Weevil, S. granarius L., to High and Low Temperatures. 
E. A. Back and R. T. Cotton___ 1043 
Uninucleated Aecidiospores in Caeoma nitens , and Associated Phenomena. 
B. O. Dodge (5 plates)_ 1045 
On Some Plant Parasitic Nemas and Related Forms. G. Steiner. 
(4 plates)----- 1059 
The Influence of Environment on Sex in Hemp, Cannabis sativa L. Hugh 
C. McPhee (1 plate; 3 text figures)____ 1067 
Spacing Experiments with Acala Cotton in Southern California. H. G. 
McKeevek (3 text figures)--- 1081 
Correlation Among Quantitative Characters in Maize. J. H. Kempton 
(1 plate; 5 text figures)_ 1095 
Effect of Fumigation upon Heating of Grain Caused by Insects. E. A. 
Back and R. T. Cotton (2 text figures)- 1103 
The Nitrification of Phosphorus Nitride. F. E. Allison--- 1117 
Aecial Stages of the Leaf Rusts of Rye, Puccinia dispersa Erikss. and 
Henn., and of Barley, P. anomala Rostr., in the United States. E. B. 
Mains and H. S. Jackson (1 plate)- 1110 
Fall Sowing and Delayed Germination of Western White Pine Seed. 
W. G. Wahlenberg (4 text figures)-- 1127 
The European Hare (Lepus europaeus Pallas) in North America. James 
Silver (1 text figure)---- 1133 
Growth on Cut-Over and Virgin Western Yellow Pine Lands in Central 
Idaho. C. F. Korstian (3 plates)-..-- 1139 
