70 Journal of Comparative Neurology and Psychology. 



on several of the author's degenerative experiments on rabbits. The 

 Marchi method was supplemented with the methods of indirect Walle- 

 rian degeneration and of Nissl. The vestibulo-spiual tract arises ex- 

 clusively after Deiter's nucleus and descends in the anterior column as 

 far as the lumbo-sacral region. The spinal portion of the posterior longi- 

 tudinal fasciculus is exclusively descending. Ascending fibers are 

 found in this tract only within the bulb and mesencephalon. Both 

 ascending and descending heterolateral fibers probably come as inferior 

 arcuate fibers either from the terminal vestibular nucleus or from the 

 tuberculum acusticum. The ascending homolateral fibers arise higher 

 up, probably from the nucleus of Bechterew. The striae medullares 

 arise exclusively in the tuberculum acusticum. G. E. c. 



Soukhanoff. Contribution a I'etude du reseau endocellulaire dans les elements 

 nerveux des ganglions spinaux. Le A'ez'rctxe, 1904, 6, 75"^°- 



The endocellular net as observed by the Kopsch osmic acid 

 method is identical with the Golgi endocellular net, and is not the same 

 structure as the canaliculi of Holmgren and others. G. E. c. 



Agababow, A. Ueber die Nerven der Sclera. Archiv f. viik. Anat., Bd. 63, 

 H. 4, pp. 701-709, 1904. 



Hyde, Ida H. Localization of the Respiratory Center in the Skate. Amer. 

 four. F/iysiol., 1904, 10, 236-258. 



By the employment of careful and precise methods of experi- 

 mentation on living skates, Miss Hvde has demonstrated the segmen- 

 tal arrangement of the respiratory center. The animal under observa- 

 tion was placed on a board, and sea-water was passed in a continuous 

 stream through a tube into the mouth. Artificial respiration could in 

 this way be maintained for days. In a skate thus situated the medulla 

 may be separated from the spinal cord and from those portions of the 

 brain lying anterior to it without destroying its function as a respiratory 

 center. 



Medisection of the medulla is followed, after the inhibitory effects 

 of shock have passed off, by a resumption of coordinated respiratory 

 movements on both sides of the body. The gill arches of one side 

 may move in a rhythm quite different from that of the opposite 

 side. The spiracles may keep time with the gill arches of their re- 

 spective sides, or both spiracles may be in rhythm with the arches of 

 one side. From the results of median section of the medulla it be. 

 came evi<lent that "the centers for the nervous respiratory mechanism 

 in the skate were bilateral, each half controlling the movements of its 

 respective side." 



Evidence of the segmental character (jf these bilateral respiratory 



