CONTENTS 
v 
Adaptive Radiation and Classification op the Proboscidea. .By H. F. Osborn 231 
Melanovanadite, a New Mineral from Mina Ragra, Pasco, Peru 
By Waldemar Lindgren 249 
BOTANY 
The Vascular Anatomy of Normal and Variant Seedlings of Phaseolus 
vulgaris By J. A. Harris and E. W. Sinnott 35 
ZOOLOGY 
The Present Status of the Long- Continued Pedigree Culture of Para- 
mecium Aurelia at Yale University By L. L. Woodruff 41 
Novocaine as a Substitute for Curare By J. F. Fulton, Jr. 114 
The Skin Temperature of Pachyderms 
By F. G. Benedict, E. L. Fox and Marion L. Baker 154 
GENETICS 
A Preliminary Note on the Results of Crossing Certain Varieties of 
NlCOTlANA TABACUM 
By W. A. Setchell, T. H. Goodspeed and R. E. Clausen 50 
An Apparent Case of Non-Mendelian Inheritance in Datura Due to a 
Disease By A. F. Blakeslee 116 
Current Maps of the Location of the Mutant Genes of Drosophila Me- 
lanogasteR By C. B. Bridges 127 
The Influence of Age on Fertility in Swine By Tage Ellinger 134 
Variation and Inheritance in Size in Trypanosoma Lewisi. I. Life-cycle 
in the Rat and a Study of Size and Variation in "Pure Line" Infections 
By W. H. Taliaferro 138 
The Globe, a Simple Trisomic Mutant in Datura ..By Albert F. Blakeslee 148 
Variation and Inheritance in Size in Trypanosoma Lewisi. II. The Effects 
of Growing "Pure Lines" in Different Vertebrate and Invertebrate 
Hosts and a Study of Size and Variation in Infections Occurring in 
Nature By W. H. Taliaferro 163 
Linkage Variation and Chromosome Maps By A. H. Sturtevant 181 
Genetical and Cytological Proof of Non- Disjunction of the Fourth 
Chromosome of Drosophila Melanogaster . . . .By Calvin B. Bridges 186 
The Behavior of Homologous Chromosomes in a Triploid Canna 
By John Belling 197 
Non- Disjunction and the Chromosome Relationships of Drosophila Willis- 
Toni By Rebecca C. Lancefield and Charles W. Metz 225 
The Prediction of Annual Egg Production from the Records of Limited 
Periods By J. A. Harris, W. F. Kirkpatrick and A. F. Blakeslee 213 
A Case of Rearrangement of Genes in Drosophila. . . .By A. H. Sturtevant 235 
BIOLOGY 
Note on Moving Equilibria By Alfred J. Lotka 168 
An Unidentified Base among the Hydrolytic Products of Gelatin 
By Donald D. Van Slyke and Alma Hi Her 185 
Note on the Economic Conversion Factors of Energy. . . .By A. J. Lotka 192 
PHYSIOLOGY AND PATHOLOGY 
The Basal Metabolism of Girls 12 to 17 Years of Age 
By F. G. Benedict, M. F. Hendry and M. L. Baker 10 
The Effect of a Variation in Milling on the Digestibility of Wheat Flours 
By C. F. Langwo'rthy and A. D. Holmes 119 
