
















CONTENTS OF THE MARCH NUMBER 
The Imperfection of Dominance and Some of its Con- 
sequences, Dr. C. B, DAVENPORT, 
Experimental Evidence on the Effectiveness of Selection. 
Professor H, S. JENNINGS. 
The Artificial Production of the Parthenogenetic and 
Sexual Phases of the Life Cycle of Hydatina senta. 
A. FRANKLIN SHULL 
The Significance of the Courtship and Secondary Sexual 
Characters of Araneads, Professor THOs. iH MONT= 
GOMERY, JR. 
Notes and Literature: 
Notes on Ichthyology, President, DAvip STARR JOR- 
pan. A New Catalogue of Hemipterous Insects, 
Professor T. D, A. COCKERELL, 











CONTENTS OF THE MAY NUMBER 
A Review of Some Recent Criticisms of the Restorations 
of Sauropod Dinasaurs, Dk, J. W. HOLLAND. 
Anatomical Characters in the Evolution of Pinus. 
Irvine W. BAILEY. 
Facts about the ‘‘ Lobster Pearl.” Professor FRANCIS 
H. HERRICK. 
Shorter Articles and Discussion; An Eighteenth Cen- 
tury Microscope, Professor BASHFORD DEAN. Sto- 
matolepas, a Barnacle Commensal in_ the Throat of 
the Loggerhead Turtle. Henry A. Pitspry. The 
Age of Speed Sires, CASPER L. REDFIELD. 
Notes and Literature: Biometrics—Recent Quantitative 
Studies in Variation in Social Insects, Dr. RAY= 
MOND PEARL. Experimental Zoology—The Effects of 
Extirpation and of Transplantation of the Repro- 
ductive Organs in Insects, E. N. BkowNE. Wheeler 
on Ants, Professor G. H, PARKER, ~ 









CONTENTS OF THE JULY NUMBER 
of Cryptogams. Professor W. G. FaRLow. 
Notes on Some Beaufort Fishes. E, W. GUDGER. 
On the Effect of External Conditions on the Reproduc- 
tion of Daphnia. Dr. J. F. McCLENDON. 
Are Fluctuations Inherited? Dr. Harry H. LOVE. 
Inheritance in Potatoes. Professor EDWARD M, FAst. 
Shorter Articles and Correspondence: The Age of Speed 
Sires: Professor F. R, MARSHALL. 
Notes and Literature: Russo on Sex-Determination and 
Artifical Modification of the Mendelian Ratios, Pro- 




H, B, WagD; Desert Plants, WILLIAM L, Bray, 

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The Origin of the Electricity Tissues in Fishes. Pro~ 
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The Material Basis of Mendelian Phenomena. Dr. RE- 
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Mendelian Phenomena without de Vriesian Theory. 
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Chromosomes and Heredity. Professor T. H. MORGAN. 
Spiegler’s “White Melanin’ as Related to Dominant or 
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