Alice Hamilton 421 



Pick's bundle. This is the case described by Hoche in the article 

 alread}^ quoted. An aberrant bundle taking the course described by 

 Pick with the exception of its termination in the corpus restiforme, 

 was found on the degenerated side in Hoche's case and could therefore 

 for the first time be accuratel}^ traced. As this bundle was partly 

 degenerated it was at once proved to be a centrifugal tract instead of a 

 centripetal, as it had formerly been held to be. Hoche traced it from 

 the level of the upper end of the nucleus nervi facialis down to the 

 pyramidal decussation, lying at first between the nucleus of this nerve 

 and the fibres going to the knee, then nearer the ventricle, and finally, 

 in the closed medulla, near the mesial end of the substantia gelatinosa, 

 and terminating in the lateral pyramidal tract. He explains it as a 

 premature decussation of some of the pyramidal fibres on one side, and 

 evidently the explanation holds good for two of the bundles described 

 by Heard, and probably for all the so-called Pick's bundles, which, it 

 would seem, should be traced from above down, instead or from below' 

 up, probably becoming separated from the pyramidal fibres at varying 

 levels in the different cases, but always terminating in the lateral 

 tracts. 



I wish to express my thanks to Dr. Hugh T. Patrick of this city, to 

 whom I am indebted for the material of this case. 



BIBLIOGEAPHY. 



Pick. — Arch. f. Psych., 1890, p. 636. 



Cramer.— Centralblatt f. allg. Path. u. path. Anat., 1890, No. 11. 



SCHAFFER. — Neurolog. Centralblatt, 1890, p. 453. 



Kronthal. — Neurolog-. Centralblatt, 1890, p. 456. 



Van Gieson. — N. Y. Med. Journal, 1892, p. 337. 



Heard. — Trans. Am. Jour. Med. Sciences, 1894, p. 140. 



Hoche. — Arch. f. Psych., 1898, p. 103. 



