









CONTENTS OF THE APRIL NUMBER 
The Origin of the Electricity Tissues in Fishes, Pro- 
fessor ULRIC DAHLGREN. 
The Material Basis of Mendelian Phenomena. Dr, Rr 
GINALD R. GATES, 
Mendelian Phenomena without de Vriesian Theory. 
Dr. W. J. SPILLMAN. 
The Evolution of New Forms in Viola through Hybrid- 
ism. Professor EzRA BRAINERD, 
Tertiary Archhelenis, Dr. A. E. ORTMANN. 
Shorter Articles and Discussion: The Probable Origin 
of the Crinoidal Neryous System: Austin H. CLARK, 
Notes and Literature: The Question of Sex Determina= 
tion: Professor H. E. Jorpan. Recent Investiga- 
tions on the Comparative Anatomy of Conifers : Pro- 
fessor E, C, JEFFREY. 


CONTENTS OF THE JUNE NUMBER 
The Botanical Society of America: 
The Nature of Physiological;Response, The Late Pro- 
fessor CHARLES R. BARNES, 
The Place of Plant Responses in the Categories of Sensi= 
tive Reactions. Professor FREDERICK C. Ni wcomBnE. 
The Larva and Spat of the Canadian Oyster. Dr, J.Six: 
FORD, 
The Alimentary Canal of a Carboniferous Salamander, 
Dr. Roy L. Mooprsz. 
Shorter Articles and Discussion: Observations on the 
Spawning Habits of Hydroides Dianthus. Professor 
CHARLES W. HARGITT, 
Notes and Literature: 
Protozoa—Doflein’s Lehrbuch der Protozoenkunde : 
Professor CHARLES A. Kororp. Celebrating Dar- 
win’s Greatness and Darwinism’s Weakness, V. L. K, 
CONTENTS OF THE AUGUST NUMBER 
Chromosomes and Heredity. Professor T. H. Mor@an, 
Spiegler’s ‘‘ White Melanin” as Related to Dominant or 
Recessive White. Dr. Ross AIKEN GORTNER. 

KARL PEARSON. 
Notes and Literature: Heredity, Dr. W. J. SPrnuman, 




Single Number 35 Cents 

The American Naturalist 
A Monthly Journal, established in 1867, Devoted to the Advancement of the Biological Sciences 
with Special Reference to the Factors of Organic Evolution and Heredity 






Shorter Articles and Correspondence: A Pickwickian 
Contribution to Our Knowledge of Wasps: Professor 





CONTENTS OF THE MAY NUMBER 
A Review of Some Recent Criticisms of the Restorations 
of Sauropod Dinasaurs. Dr, 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. Pinspry. The 
Age of Speed Sires, CASPER L. REDFIELD. 
Notes and Literature: Biometrics—Recent Quantitative 
Studies in Variation in Social Insects, Dr. RAyY- 
MOND PEARL. Experimental Zoology—The Effects of 
Extirpation and of Sean spe aon of the Repro- 
ductive Organs in Insects, E. N. Brownz. Wheeler 
on Ants, Professor G. H, PARKER, 
CONTENTS OF THE JULY NUMBER 
A Consideration of the “Species Plantarum’’of Linnaeus 
as a Basis for the Starting Point of the Nomenclature 
of Cryptogams. Professor W. G. FARLOW. 
Notes on Some Beaufort Fishes. E. W. Gupanmr. 
On the Effect of External Conditions on the Reproduce 
tion of Daphnia. Dr. J. F. McCLenpon, 
Are Fluctuations Inherited? Dr. Harry H. Loyn. 
Inheritance in Potatoes. Professor EDWARD M. East. 
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- 
fessor W. E. CASTLE; The Bubonic Plague, Professor 
H. B, WArD; Desert Plants, WinLIAM L. BRAY, y 
CONTENTS OF THE SEPTEMBER NUMBER 
Nuclear Phenomena of Sexual Reproduction in the 
Alge. Dr, BRADLEY MoorE Davis. 
Nuclear Phenomena of Sexual Reproduction in Fungi, — 
PROFESSOR R. A, HARPER, ; 
The Pose of the Sauropodous Dinosaurs. Dx. W. D, 
MATTHEW. 
Shorter Articles and Discussion : Evolution without Iso 
lation, Dr. Joun T. Guiick. Retroactive Selection, 
CaspER L. REDFIELD. The Logic of Chance in 
Problems of Genetics, ARTHUR S. DEWINe. 
Notes and Literature: Animal Structure and Habits, 
Professor G. H. PARKER. Plant Physiology, C. L. 
SHEAR. 
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