The American Naturalist 



A Monthly Journal, established in 1867, Devoted to the Advancement of the Biological Sciences 

 with Special Reference to the Factor* of Organic Evolution and Heredity 



CONTENTS OF THE DECEMBER NUMBER 



The Cuticula and Subcuticula of the Trematodes and Ces- 

 todes. Professor Heney S. Peatt. 



The American Toad (Bufo lentiginosus americanus, 

 LeConte). Newton Milleb. 



Observations on Copulation among Crawfishes with 

 Special Reference to Sex Recognition. Dr. A. S. 

 Peabse. 



Shorter Articles and Correspondence : Degeneration ac- 

 companying Inbreeding. Professor C. B. Daven- 

 poet. A Note of the Prairie-dog Owl which Re- 

 sembles the Rattlesnake's Rattle: Dr. J. Aethue 

 Harris. 



Notes and Literature : The Causation of Sex, Professor 

 ■» H. E. Jordan. 



Index to Volume XLJJL 



CONTENT8 OF THE JANUARY NUMBER 



The Reappearance in the Offspring of artificially pro- 

 duced Parental Modifications. Dr. Francis B. 

 Sumner. 



A Bimodal Variation Polygon in Syndesmon thalictroides 

 and its Morphological Significance. Dr. J. Aethue 

 Harris. 



The Miocene Trees of the Rocky Mountains. Professor 



T. D. A. COCKEEELL. 



A Suggestion regarding Heavy and Light Seed Grain. 

 L. R Waldeon. 



Notes and Literature : Mammalogy — Nelson's Monograph 

 of the North American Leporidae, Dr. J. A. Allen. 

 Neurology — Edinger's Vorlesungen iiber den Bau der 

 nervosen Centralorgane, Professor G. H. Paekeb. 



CONTENTS OF THE FEBRUARY NUMBER 



A Mendelian Interpretation of Variation that is Appar- 

 ently Continuous. Professor Edward M. East. 



Color Inheritance 'in ; Lychnis dioica L. Dr. George 



Haeeison Shull. 

 Is Regeneration a Repetition of the Ontogenetic and 



Phylogenetic Processes ? Seegius Morgulis. 

 Genetical Studies on Oenothera. Bradley Moore 



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 Parthenogenetic 

 Eggs of Hymenoptera Produce only Males. A. 

 Feanklin Shull. 



CONTENTS OF THE MARCH NUMBER 



The Imperfection of Dominance and Some of its Con- 

 sequences. Dr. C. B. Davenpoet. 



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. Feanklin Shull 



The Significance of the Courtship and Secondary Sexual 

 Characters of Araneads. Professor Thos. H. Mont- 

 gomeey, Je. 



Notes and Literature : 



Notes on Ichthyology, President, David Stare Jor- 

 dan. A New Catalogue of Hemipterous Insects, 

 Professor T. D. A. Cockkrell. 



CONTENTS OF THE APRIL NUMBER 



The Origin of the Electricity Tissues In Fishes. Pro- 

 fessor Uleic Dahlgeen. 



The Material Basis of Mendelian Phenomena. Dr. Re- 

 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 Beainerd. 



Tertiary Archhelenis. Dr. A. E. Ortmann. 

 Shorter Articles and Discussion : The Probable Origin 

 of the Crinoidal Nervous System : Austin H. Claek. 



Notes and Literature : The Question of Sex Determina* 

 tion : Professor H. E. Joedan. Recent Investiga* 

 tions on the Comparative Anatomy of Conifers : Pro" 

 fessor E. C. Jeffrey. 



CONTENTS OF THE MAY NUMBER 



A Review of Some Recent Criticisms of the Restorations 

 of Sauropod Dinasaurs. De. J. W. Holland. 



Anatomical Characters in the Evolution of Pinus. 

 Ieving W. Bailey. 



Facts about the "Lobster Pearl." Professor Feancis 

 H. Heeeick 



Shorter Articles and Discussion : An Eighteenth Cen- 

 tury Microscope, Professor Bashford Dean. Sto- 

 matolepas, a Barnacle Commensal in the Throat of 

 the Loggerhead Turtle. Heney A. Pilsbey. The 

 Age of Speed Sires, Caspee 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. Browne. Wheeler 

 on Ants, Professor G. H. Paekeb. 



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