No. 2.] 



HISTOGENESIS OF THE RETINA. 



427 



hardened in picro-chromic and osmic acids, a method by which 

 the optic nerve fibers are most decidedly marked. This 

 observation is by no means remarkable when we take into 

 consideration the newer histology of the retina as given us by 

 Dogiel,! by Ramon y Cajal 2 and by Tartuferi.^ To these 

 authors, and especially the former, we owe our knowledge of 



Fig. 12. — Semi-diagrammatic reconstruction of the human retina from the 

 drawings of Dogiel. 



the origin of the optic nerve in the various layers of the retina. 

 Fig. 12 is a compilation of several of Dogiel's figures and shows 

 his interpretation of the retina obtained by the methylin blue 



1 Dogiel, Anatom. Anz., iSSS, and Archiv. fiir mik. Anat., Bd. 38, 1891. 



2 Ramon y Cajal, Anatom. Anz., 1889. 



2 Tartuferi, Salla anatomia della retina, Torino, 1887. 



