STUDIES IN THE RETINA. 25 



Studies in the Retina. 



Parts III, IV, and V, with Summary.^ 



By 



Henry M. Beriinrd, M.A.Cantab. 



(From I lie Biological Laboratories of the Royal College of Science, London. 



WiUi Plates 3—5. 



Part III. 

 The Migration of the Retinal Nuclei. 



In this third part I had hoped to have dealt further with 

 the material absorbed by the rods from the pigmented 

 epithelium ; two important points, however, demand im- 

 mediate attention. In Part I, in referring to the migration 

 of the nuclei, I slightly misquoted Borysiekiewitz's observa- 

 tions, and in Part II I left a serious gap in the description of 

 the outer ends of the developing rods. They were shown in 

 the figures (e.g. PI. 31, fig. 29) as if truncated, just, indeed, 

 as they appeared in the sections. This gap I am now in a 

 position to fill (see Part IV), while Part V will describe the 

 fate of the absorbed pigment. 



Referring to the migration of the nuclei from the middle 

 nuclear to the outer nuclear layer in Part I (p. 44), astonish- 

 ment w^as expressed that it had not been noticed before. 

 The only observer who, so far as I am aware, had called 



' For Parts I and 11 see this Jouunal, vol. xliii, 1900, p. 23, and vol. xliv, 

 1901, p. 443. 



VOL. 46, I'AKT 1. — NEW SEItJES. B* 



