The American Naturalist 



A Monthly Journal eitabliahed in 1867. Devoted to the Advancement of the Biological Science* 

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



OONTENT8 OF THE MAY NUMBER 



oTS^ter^ret««oa P o? f ^r^ Tropfsm* of Insect*. 

 The Erolution of Tertiary Mammal* and the Importance 

 On Xe rophytic Adaptation* of Leaf Structure in Yuccas) 

 Agaresand 



of^907* H Dr.r?A^isB!s?iSncB. ° rUie * 



The Ancestry of the Caudate Amphibia, Dr. Rot L» 



The Spirochetes and their Relationship to other Organ* 

 ism*. Professor Henry B. Ward. 



Physiology. Professor Frederic 8. Lee. 



Notes and Literature: Biometries— Recent Contribution* 



Heredity of Hair Form In Man. Gertrude C. Davek- 

 Hotea wd 1 LSratar* t^AW^Sa-Renewed In- 

 te^Mn^Reeent^^oidA otih'wjiet 



to Theory, Professor Bathos© Pearl. Prolotoa— 

 Some AmffibaJStadiea^Q. N. C .Wgli'H ll 



CONTENTS OF THE JULY NUMBER 



A New Mendelian^ Ratio and^Sereral Type* of Latency. 



Abnormal^Incisori of Marmot* Monax L. ChaBUM 

 A Note ra°4e Coloration of Plethodon Cinereus. Hugh 



^S^n^^^ChTck?*??^^? M AMAN °£ °Hui£ 



| Note* and^Lherature^/cA.'Ayofo^— Life^Ystory of the 

 I Eel, Professor Charles A. Kofoid ; The Valves in the 



CONTENTS OF THEJLUGUST NUMBER 



The^Life^Cyde of Paramecium^when subjected^ to a 



Placobdella Pediculata n. sp. Ernest E. Heminway. 

 Marine Laboratories and our Atlantic Coast. Dr. Al- 



Biometry as a Method in Taxonomy. Professor 



Charles Lincoln Edwards. 

 Shorter Article* and Correspondence : The Genus Ptilo- 



from^he^jwer °Miocene of^Nebraska, Harold 

 Notes and Literature : Plant Cytology-Some Recent Re- 



I Heart of Fishes, President David Starr Jordan. 



1 Diseases: A Society for the Destruction of Vermin, 

 H. B. W. Plant Cytology— ?<A&r Organization of 

 Plant Cells, Dr. Bradi^y M. Davis, 



Bradley M. Davis. OraifAotooy— Riddle on the 

 of Light and ^rkBars^in^eath*rs^L_A. A. Hei^ 

 — HybrMLepMopter^ Cockrrkll. 



OONTENT8 OF SEPTEMBER NUMBER 

 Some results of the Florissant Expedition of 1908. 

 Embryology of Myosuru* Minimus. Da, Libot D. 

 Another Aspect of the Specie* Question. Da. J. A. 



The Origin of the Lateral Eyes of Vertebrate* 



Professor G. H. Parkek. 

 Note* and Literature : //er«r«y— Spurious Allele. 



morphism, ^Results of Sonje^ Recent^Investiga- 



Dr^IrIdley^L^a^^ 



th^oldea^Protowor Cha^RLmL. Edwards En- 



and on the Ankylosauridse, Professor s' W 

 Wiixiston. Pam*itology—Tht Erolution of 

 Parasitism; Trypanosomes, H. B. W. 



CONTENT8 OF THE OCTOBER NUMBER 



The Manifestations of the Principles of Chemical 



The Desiccation of Rotifers. D. D. Whitney. 



On the Habits and the Pose of the Sauropodous Dina- 



saurs, especially of Diplodocu*. Dr. Oliver P. 



Hay. ^ ^ j ii g b- 



Notes and Literature: Heredity— Recent Studies In 

 Human Heredity, Dr. F. A. Woods. Ornithology— 

 Riddle on the Cause of the Production of Down and 

 Down-like Structures in the Plumages of Birds, J. 

 A. A. Vertebrate Paleontology- New Fossil Mam- 

 mal* from Egypt, T. D. A. C. 



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