clx Journal of Comparative Neurology. 



by treating Golgi preparations with chlorine water to bleach the pig- 

 ment. One to several medullated fibres pass toward the chromato- 

 phore. Small ones are innervated by a single fibre, which divides 

 into two or more fine varicose branches, which terminate in tuberosi- 

 ties on the surface of thechromatophore. Lower down these branches 

 anastomose. From this anastomosis are given off numerous fine fibres 

 which end in dendrites and constitute the specific termini of the nerves 

 of the chromatophores. 



E. Ballowitz has investigated the same problem by the same 

 method,- with essentially similar results but with important additions. 

 The chromatophores contain two kinds of pigment, usually brown 

 and black. It is a common belief that the pigment cells possess 

 amoeboid motions by which they are able to contract or expand the 

 pigment diffused through their bodies, the latter being effected by 

 thrusting out protoplasmic processes into adjacent intercellular spaces. 



It has, however, been recently shown that these protoplasmic 

 processes are permanently expanded and that the pigment granules 

 migrate within the cell. These granules are radially arranged about a 

 central "attraction sphere." All chromatophores are in nervous con- 

 nections with each other and with their nerves by anastomoses, very 

 much as described above. The anastomosing, varicose branchlets of 

 the terminal dendrites, however, from an extensive nerve-complex 

 both upon and within the cells. 



In cells with extended pigment masses nerve fibrillae can be seen 

 spread out on both upper and lower walls of the cell, with some 

 branches passing clear through the cells to join the reticulum of the 

 opposite side, sometimes branching within the cells and terminating 

 in tuberosities. These inter-cellular termini are very numerous in all 

 parts of the cell. They, however, are in no way related to the "at- 

 traction sphere" nor to the nucleus of the cell. The cell protoplasm, 

 then, is the medium of innervation of the pigment granules. 



In the "contracted" pigment cells the pigment granules are all 

 massed at the centre of the cell, obscuring the nerve termini in that 

 region but leaving those in the other parts of the cell very clear and 

 unobstructed. 



Ganglion Cells and Nerve Termini in the Ventricle of the Heart.' 



Dr. Berkley has been applying the rapid Golgi and picric-acid- 

 osmium-bichromate methods to the study of the nervous structures of 



'Berkley, A. J. On Complex Nerve Terminations and Ganglion Cells in 

 the Muscular Tissue of the Heart Ventricle. Anat. Anzeiger IX I, 2. 



