CONTENTS. 



LECTURE PAGE 



I. TJic Structure of Pt'otoplasm. E. B. Wilson . . i 



II. Ccll-Lineagc and Ancestral Reminiscence. E. B. 



Wilson 21 



III. Adaptation in Cleavage. F. R. Lillie .... 43 



IV. Protoplasmic Movement as a Factor of Differen- 



tiation. E. G. Conklin 69 



V. Equal and Unequal Cleavage in Annelids. A. L. 



Treadwell 93 



VI. riie Cell Origin of the Prototroch. A. D. Mead . 113 



VII. P elation of the Axis of the Embryo to the First 



Cleavage Plane. C. M. Clapp 139 



VIII. Observations oji Various Nucleolar Structures of 



the Cell. T. H. Montgomery, Jr 153 



IX. Protoplasmic Contractility and Phosphorescence. 



S. Watase 177 



X. Some Problems of Regeneration. T. H. Morgan 193 



XI. The Elimination of the Unfit as Illustrated by 

 the Introduced Sparroiu, Passer Domcsticus. 

 H. C. BuMPUs 209 



XII. On the Heredity of the Marking in Fish Embryos. 



Jacques Loeb . 227 



XIII. Do the Reactions of Lozvcr Animals Due to Injury 



Indicate Pain-Sensations? W.W.Norman. 235 



XIV. North American Ruminant-Like Mammals. W. B. 



Scott 243 



XV. Caspar FriedricJi Wolff and the Theoria Gene- 



rationis. W. M. Wheeler . . . . . . 265 



XVI. Animal Behavior. C.O.Whitman 285 



