STUDIES IN THE RETINA. 303 



Studies in the Retina. 



Part VI. — The Continuity of the Nerves thi'ough the Vertebrate 



Retina. 



By 



H. M, Bernard, M.A.Caiilab. 



(From the Zoological Laboratories of the Royal College of Science.) 



With Plates 27—29. 



This sixth paper concludes the series.^ It was my original 

 plan to publish any observations I might be fortunate enough 

 to make which threw light on the general structure of the 

 retina^ as introductory to a series of comparative studies on 

 the eyes of different groups of animals, the ultimate object 

 beiug to accumulate and elaborate the evidence which had 

 seemed to me to point to a mechanical theory of vision.^ 

 Whether the original plan will ever be carried out remains 

 to be seen. I express the doubt because the new matter 

 contained in this paper threatens to draw me off into other 



' Part I appeared in vol. xliii, p. 23 ; Part II in vol. xliv, p. 4-43 ; and 

 Parts III, IV, and V in vol. xlvi, pp. 25, 40, and 48 of this Journal. 



- An outline sketch of this theory was given in the ' Ann. and Mag. Nat. 

 Hist.,' xvii (1896), p. 162. Practically the same theory has been recently 

 presented to the French Academy by Professor Pizon, see ' C. R.,' cxxxiii, 

 1901, p. 835. There are slight differences of detail, but, so far as I can 

 make out, not where Professor Pizon thinks they lie. 



