iv CONTENTS. 



V. Alice L. Gaule. Pages 



Biological Changes in tJic Spleen of the 



Frog 393-414 



VI. F. Mall. 



Histogcjiesis of the Retina in Amblystoma 



and Nectnnis 415-432 



VII. S. Watase. 



Homology of the Centrosome .... 433-444 



No. 3. — August, 1893. 



I, Howard Ayers. 



The Auditory or Hair-cells of the Ear 

 and their Relations to the Auditory 

 Nerve 445-466 



II. Herbert P. Johnson, 



A Contribution to the Morphology and 



Biology of the Stentors 467-562 



III. Louise B. Wallace. 



The Structure and Development of the 



Axillary Gland of Batrachus . . . 563-568 



IV. F. R. Lillie. 



Preliminary Accoimt of the Embryology 



of Unio Complanata 569-578 



V. Edmund B. Wilson. 



Amphioxus, and the Mosaic Theory of 



Development 579-638 



VI. C. O. Whitman. 



Tlie Inadequacy of the Cell-Theory of 



Development 639-658 



(3tbc ?ltbcna:um "pxtH 



GINN & COMPANY, BOSTON, U.S A 



