CONTENTS 



No. I — November, 1907 



David Day Whitney 



Determination of Sex in Hvdatina senta i 



Arthur B. Lamb 



A New Explanation of the Mechanics of Mitosis. Wirii Two Figures. ... 27 



Herbert Eugene Walter 



The Reactions of Planarians to Light. With Fourteen Figures ^5 



No. 2 — December, 1907 



Herbert Eugene Walter 



The Reactions of Planarians to Light. With Fourteen Figures (con- 

 cluded) 117 



Mary Isabelle Steele 



Regeneration in Compound Eyes of Crustacea. With Sixteen Plates and 



Two Figures in the Text 1 63 



H. V. Wilson 



On Some Phenomena of Coalescence and Regeneration in Sponges. 



With Four Figures 245 



Hans Przibram 



Equilibrium of Animal Form. With Ten Figures 259 



Charles Zeleny 



The Effect of Degree of Injury, Successive Injury and Functional Activity 

 upon Regeneration in the Scyphomedusan, Cassiopea .xamachana. 

 With Four Figures 265 



Alexander Petrunkevitch 



Studies in Adaptation. I. The Sense of Sight in Spiders. With Six 

 Figures 275 



