CONTENTS 
Page 
Foreword. B. T. G allow ay . i 
Citrus Ichangensis, a Promising, Hardy, New Species from 
Southwestern China and Assam. Walter T. Swingle . i 
Cysticercus Ovis, the Cause of Tapeworm Cysts in Mutton. 
B. H. Ransom. 15 
The Serpentine Leaf-Miner. F. M. Webster and T. H. Parks. . 59 
The Occurrence of a Cotton Boll Weevil in Arizona. W. DwtghT 
Pierce. 89 
The Diagnosis of Dourine by Complement Fixation. John R. 
Mohler, Adolph Eichhorn, and John M. Buck. 99 
Three Undescribed Heart-Rots of Hardwood Trees, Especially of 
Oak. W. H. Long. 109 
Individual Variation in the Alkaloidal Content of Belladonna 
Plants. Arthur F. Sievers. 129 
The Pubescent-Fruited Species of Prunus of the Southwestern 
States. Silas C. Mason. 147 
Selective Adsorption by Soils. E. G. Parker. 179 
A Bacterium Causing a Disease of Sugar-Beet and Nasturtium 
Leaves. Nellie A. Brown and Clara O. Jamieson. 189 
The Calliephialtes Parasite of the Codling Moth. R. A. Cushman . 211 
Polyporus Dryadeus, a Root Parasite on the Oak. W. H. Long .. 239 
The Foot-Rot of the Sweet Potato. L. L. Harter. 251 
Environmental Influences on the Physical and Chemical Charac¬ 
teristics of Wheat. J. A. LE ClERC and P. A. Yoder. 275 
A Drought-Resisting Adaptation in Seedlings of Ho£i Maize. 
G. N. Collins. 293 
Some Diseases of Pecans. Frederick V. Rand. 303 
A Twig Blight of Quercus Prinus and Related Species. Della E. 
Ingram. 339 
New Potato Weevils from Andean South America. W. Dwight 
Pierce. 347 
An Undescribed Species of Gymnosporangium from Japan. W. H. 
Long. 353 
The Presence of Some Benzene Derivatives in Soils. Edmund C. 
Shorey. 357 
in 
