CONTENTS 



No. 1. OCTOBER, 1917 



E. J. Li nd. Reversibility of morphogenetic processes in Bursaria. Thirty- 

 eight figures 1 



R. T. Yodng. Experimental inducl ion of endomixis in Paramaecium aurelia. 



Three plates 35 



Libbie H. Hyman. Metabolic gradients in Amoeba and their relation to the 

 mechanism of amoeboid movement. Fourteen figures 55 



l>\vrD Day Whitney. The relative influence of food and 'oxygen in con- 

 trolling sex in rotifers. Four figures and four diagrams 101 



(I. H. Parker. The pedal locomotion of the sea-hare Aplysia californica. 



One figure 139 



No. 2. NOVEMBER, 1917 



Harold H. Plough. The effect of temperature on crossingover in Droso- 

 phila. Nine figures 147 



W. J. Crozier. The photic sensitivity of Balanoglossus 211 



G. H. Parker. The power of suction in the sea-anemone Cribrina. One 

 figure 219 



J. M. D. Olmsted. Notes on the locomotion of certain Bermudian mol- 

 lusks. One figure 223 



Eduard Uhlenhuth. A further contribution to the metamorphosis of 

 Amphibian organs. The metamorphosis of grafted skin and eyes of Am- 

 blystoma punctatum. Five plates and three text figures 237 



G. II. Parker. The activities of Corymorpha 303 



J. M. D.Olmsted. The comparative physiology of Synaptula hydriformis 



(Lesueur). Two figures 333 



William A. Kiopner and .1. Graham Edwards. Food-reactions of I'elo- 



myxa carolinensis Wilson. Fourteen figures 381 



E. [. Werber. Experimental studies on the origin of monsters. II. Regard- 

 ing the morphogenesis of duplicities. Twenty-seven figures 409 



No. 3. JANUARY, 1918 



Theophilus S. Painter. Contributions to the study of cell mechanics. 



II. Monaster and narcotized eggs. Ten text figures and five plates. . . . 445 

 Bennet M. Allen. The results of thyroid removal in the larvae of Rana 



pipiens. Eight text figures and one plate 499 



