The American Naturalist 



A Monthly Journal, eatablkhed in 1867. Devoted to the Advancement of toe Biological Science* 

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



00NTENT8 OF THE MAY NUMBER 



Qe °f)ecapod Fauna. Pro^esso?A?E. Yehrill. ^ 

 On the Interpretation of Certain Tropiams of Insect*, 



The Evolution of Tertiary Mammals and the Importance 

 of their Migrations. Professor Charles Deprret. 

 On X ; - \ 

 Th- 



0ONTENT8 OF THE JUNE NUMBER 

 the Anceatry of the Caudate Amphibia, Dr. Bot U 



The Spirochete* and their Relationship to other Organ- 

 ism*, Professor HxsryB. Ward. 

 The Faunal AffiniUe* of the Prairie Region of Central 



KoteaandLitexature: Btomelrte^B^mt Contribution 

 to Theory, Professor Raymond Pearl. Protozoa~ 



OONTENT8 OF THE JULY NUMBER 



The^g G T^dL?^n^c^F^fe8»or C. W. WOOD- 

 Abnormal Incisors of Marmota Monax L. CHARLES 



A Note on the Coloration of Plethodon Cinereus. Hugh 



^^"SS'toeiet^rSn £ateMtton°of VeSnX 



CONTENTS Of THE.AUOU6T NUMBER 



The Mid-summer Bird Lille of Illinois : A Statistical 

 Study. Profeeaor 8. A. Forbes. 



Placobdella Pedicnlata n. sp. Errrut EL HnmrwAY 

 Marine Laboratories and our Atlantic Coot l)i Al- 



ffi0 ffiLS^ESt>WA.i aIOn0,DT - PTOfe - 0r 



Shorter Articles and^Correspondence : The Genus Ptllo- j 



^^^M^^^Sa^RlddS^on toe 

 of Light and Dark BarTin Feathers* ?JlS^R 

 CnfcofSTSuU^eTj Ti^f^Jr 

 -Hybrid Lepidoptera, Pro fesao r 1\ D. A. CoXSE 



aome°reSS M of 8 th F Fl E ri TEMB f " MUMBER 

 Km |^°^^°^ My<»uS C "inim 1 ^ Dr. Liroy D. 



The^rigja^ of toe Lateral Eyea of Vertebrate* 

 Notes and Literature : J/«red«y-Spnxious Allelo- 



uons ^'i^^iJ^mSSS^^ 111 ^^ 



: • • - - , . 



The Manifestations of the Principles o^Chemleml 

 Mechanics in the Lixing Plant. Dr. F. F. Blace- 



The Desiccation of Rotifer*. D. D. Whiwit. 



On the Habit, and the Poae of the Sanropodona Dina- 

 aaurs, especially of Diplcdocus. Dr. Ouvrr P. 



AuMTtncH^ 8 ^*^ Profees^r 6 ^!!!^ 



RjXofth^^Sf^^^^^- 

 Biddle on the Cause of the Production of Down and 

 JJown-Uke Structures in the Plumages of Birds, J. 



Vertebrate /nfeonftrfojy-New Foasil Mam- 

 mals from Egypt, T. D. A. C. 



Single Number 35 Cents Y ~. 1 e i_ . - 



THE SCIENCE PRESS 



Carbon, N. Y. Substation 84: NEW YORK p. 



