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


CONTENTS OF THE JANUARY NUMBER 
The Reappearance in the Offspring of artificially pro- 
eae Parental Modifications. Dr. Francis B, 
UMNER. 
A Bimodal Variation Polygon in Syndesmon thalictroides 
Se its Morphological Significance. Dr. J. ARTHUR 
ARRIS. 
The Miocene Trees of the Rocky Mountains, Professor 
T. D. A, COCKERELL, 
A Suggestion regarding Heavy and Light Seed Grain. 
L. R. WALDRON. 





Notes and Literature: Mammalogy—Nelson’s Monograph 
of the North American Leporide, Dr. J. A. ALLEN, 
Neurology—Edinger’s Vorlesungen iiber den Bau der 
nervosen Centralorgane, Professor G. H. PARKER, 




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, 5. 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. H. Mont- 
GOMERY, JR. 
Notes and Literature: 
Notes on Ichthyology, President, DAavip 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. Dr. J. W. HOLLAND. 
Anatomical Characters in the Evolution of Pinus, 
Irvine W. BAILEY. 
Facts about the ‘‘ Lobster Pearl.” 
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 Trans lantation of the Repro- - 
ductive Organs in Insects, E. N. Browne. Wheeler 
on Ants, Professor G, H. PARKER. 





Professor FRANCIS 











Single Number 35 Cents 
CONTENTS OF THE FEBRUARY NUMBER 
A Mendelian Interpretation of Variation that is Appar 
ently Continuous. Professor EpwARD M. EAsT, 
Color Inheritance in Lychnis dioica L. Dr. GEORGE 
HARRISON SHULL. 
Is Regeneration a Repetition of the Ontogenetic and 
Phylogenetic Processes? SERGIUS MORGULIS., 
Genetical Studies on Cnothera, BrapDLEY Moorgz 
Davis. 
Shorter Articles and Discussion : 
The Mendelian View of Melanin Formation. Dr. 
W. J. SPILLMAN. 
Notes and Literature: Seton’s Life History of Northern 
Animals, Dr. J. A. ALLEN. Do Parthenogeneti¢ 
Eggs of Hymenoptera Produce only Males, A, 
FRANKLIN SHULL, 

CONTENTS OF THE APRIL NUMBER 
The Origin of the Electricity Tissues in Fishes, 
fessor ULRIC DAHLGREN, 
The Material Basis of Mendelian Phenomena, Dr. Rm 
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 Nervous System: AUSTIN H. CLARK). 
Notes and Literature: The Question of Sex Determinay' 
tion: Professor H. E, JORDAN. Recent Investiga7* 
tions on the Comparative Anatomy of Conifers : Pre ¢ 
fessor E, C, JEFFREY. 
Pa 
—— 
CONTENTS OF THE JUNE NUMBER 
The Botanical Society of America : j 
The Nature of Physiological;Response., The Late P.‘ro= 
fessor CHARLES R. BARNES, 
The Place of Plant Responses in the Categories of Sei nsiz — 
tive Reactions. Professor FREDERICK C. NEWCOMiBE: 
The Larva and Spat of the Canadian Oyster. Dr, J. Sar 
FORD. = 
The Alimentary Canal of a Carboniferous Salaman¢ler, 
Dr. Roy L. Moopigr. 
Shorter Articles and Discussion: Observations on \the3 
Spawning Habits of Hydroides Dianthus. Profegs:oir 
CHARLES W. HARGITT. 
Notes and Literature: A 
Protozoa—Doflein’s Lehrbuch der Protozoenkundd >: — 
Professor CHARLES A. Kororp. Celebrating Da m 
win’s Greatness and Darwinism’s Weakness, V. L. }) C, 
Yearly Subscription, $4.0 0 
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