CONTENTS. 



LEADING ARTICLES. 



On Heredity and Rejuvenation C- S. MiNOT I, 



Lost Characteristics. A. Hyatt 



Variation After Birth. L. H. Bailey 



A Comparative Study of the Point of Acute Vision in the Vertebrata 

 (Illustrated). J. R. Slonaker , 



Some Localities for Laramie Mammals and Horned Dinosaurs ( Illus- 

 trated). J. B. Hatcher 



The History and Principles of Geology, and Its Aim. J. C. Hartzeix, 



! Constancy of Bacterial Species in Normal Fore B 



Iilk. H. L. Bol- 





3s of New Guinea (Continued from p. 1065, Vo] 



..XXIX). G. S. 



The Bearing of the Origin and Differentiation of the Sex Cells in 

 Cymatogaster on the Idea of the Continuity of the Germ Plasm. 

 Care H. Eigenmann 



The Probable Influence of Disturbed Nutrition on the Evolution of 

 the Vegetative Phase of the Sporophyte. G. F. Atkinson 



Progress in American Ornithology, 1886-1895. R.W. ShcfeldT 



The Path of the Water Current in Cucumber Plants. E. F. Smith. 

 372, 45i, 



On the Mississippi Valley Unionidae Found in the St. Lawrence and 

 Atlantic Drainage Areas. C. T. Simpson 



A New Factor in Evolution. J. Mark Baldwin 44!, 



Extensive Migration of Birds as a Check Upon the Production of Geo- 

 graphical Varieties. T. H. Montgomery 



The Plant Geography of Germany. Roscoe Pound 



The Classification of Diatoms. C. J. Elmore 



The Oldest Civilized Man (Illustrated). E. D. Cope 



The Role of Acid in the Digestion of Certain Rhizopods. J. C. Hem- 



The Bacterial Diseases of Plants : A Critical Review of the Present 

 State of Our Knowledge. E. F. Smith 626, 716, 796, 



The Meaning and Structure of the So-called " Mushroom Bodies " of 

 the Hexapod Brain. F. C Kenyon 



Prof. Baldwin's "New Factor in Evolution." Herbert Nichols 



