422 JOHN H. STOKES 



The drawings constituting the figures under consideration 

 were made by the use of the projection lantern, everj^ possible 

 detail obtainable being filled in in this way. The pen and ink 

 work was then done on the projected outline, additional detail 

 being obtained by the use of the binocular microscope, and every 

 effort being made to make both detail and general effect corre- 

 spond as closely to the original as the medium in use would permit. 

 The diagrammatic has been studiously avoided, especially in con- 

 nection with doubtful points. A system of abbreviated labelling 

 was adopted, which it is hoped will be intelligible practically on 

 first inspection, without the use of a key. Where conventional 

 labelling appeared unsatisfactory, letters were used and referred 

 to in the legend. 



Inasmuch as the models were developed primarily from the 

 transverse sections, consideration of the topographical detail may 

 appropriately begin with them. 



Fig. 5. Series A, slide 98, row 2, section 2. This section is 

 taken at the level of the posterior part of the radix N. cochlearis 

 (see figs. 1 and 2). It presents very satisfactorily the manner 

 in which the fibers of the cochlear root pierce the corpus restiforme, 

 and the medial situation of both cochlear nuclei as regards that 

 tract. Indications of the imbricated character of the strands in 

 the ventral nucleus, a very characteristic appearance in the region 

 of entrance of the nerve in all the sections, and of the extension of 

 the grey matter downward between the strands of the nerve, are 

 apparent. The corpus ponto-bulbare and its connection with the 

 tuberculum are prominent in this region. The connection with 

 the tuberculum consists of a distinct band of fine fibrils arch- 

 ing over the dorsal surface of the corpus restiforme. In these 

 preparations no signs of ganglion cells associated with them, either 

 in the tuberculum or in the corpus ponto-bulbare could be made 

 out. It may be noted incidentally that one of the newer series 

 mentioned under the heading of Materials and Methods, owing 

 to a more intense Weigert staining, exhibits this connection 

 between the tuberculum and the corpus ponto-bulbare in a more 

 striking fashion than does the section figured. As regards the 

 vestibular, the close relation between the descending root and its 



