194 EXPLANATION OF THE PLATES. 



FIG. II. Grey matter from the cerebellum. 1, Apolar 

 cells ; 2, mass of nuclei grouped around the cells ; 3, fine nerve 

 fibres varicose. 



FIG. III. Superior cervical ganglion. 1, Nerve cells 

 imbedded in a faintly fibrillated substance containing nuclei 

 similar to those represented on the cell at (8). 



PLATE XIY. 



TERMINATION OF NERVE-FIBKES. AKTEKIES. 



FIG. L Nerve-fibre from the subcutaneous pectoral mus- 

 cle of the frog ; 1, muscular fibre ; 2, nerve fibre; 3, terminal 

 ramifications. 



FIG. II. Pacinian corpuscle. 1, Its pedicle ; 2, its cor- 

 tical substance divided into lamellae by concentric lines, on the 

 concave surface of which numerous little nuclei are seen pro- 

 jecting ; 3, its central cavity filled with finely granular matter, 

 and a considerable number of nuclei with pale outlines ; 4, the 

 nerve fibre which forms the axis of its pedicle, running into its 

 central cavity, where it ends in a slight enlargement. 



FIG. III. Termination of a nerve fibre of the retina 

 (after H. Muller). 1, Nerve-cells ; 2, fibres from the optic 

 nerve ; 3, another fibre on its way to rejoin the club-shaped 

 bodies of the external layer of the retina. 



FIG. IV. Transverse section of the primitive carotid 

 artery of a child 15 years of age magnified 120 diameters. 

 1, Internal coat ; 2, middle coat ; 3, external coat. 



FIG. V. The same section treated by acetic acid and exa- 

 mined with a magnifying power of 400 diameters. 1, Internal 

 coat ; the transverse section of the elastic fibres of which it is 

 composed are visible ; 2, middle coat ; 3, nuclei of muscular 

 fibres ; there is a pale line (4) on each side of the nuclei, indi- 

 cating the limits of the muscular fibres ; 5, elastic fibres ; 6, 

 same, in transverse section. 



FIG. VI. The same artery. 1, Middle coat ; 2, external 

 coat, composed of elastic fibres, most of which run longitudi- 



