liv Journal of Comparative Neurology. 



stumps disappear and the sensory root attached to the ganglion also 

 disappears. Moreover the ganglion itself degenerates on section of 

 the peripheral nerves. JosephI found that Waller's law holds good for 

 the section of the motor root, but that when the dorsal root is cut some 

 fibres degenerate in the ganglion and peripheral nerve, and after section 

 of the peripheral nerve a partial degeneration of the ganglion and root 

 follows. Kahler2 investigated the subject with care and found Waller's 

 law to be sustained. 



Singer and MuenzerS reinvestigated this matter by means of 

 Marchi's method and, aside from traumatic degeneration and normal 

 atrophy, find that W'aller's law prevails without exception. These 

 results agree with those of Krause and Friedlander.'l 



It seems to the writer that the divergence between the authors 

 quoted may be explained in part at least by the fact that Singer and 

 Miinzer operated upon the sciatic roots, while the other investigators used 

 the cervical. It is certain that the course of the fibres is much more 

 complex in the cervical ganglia and roots and the simple scheme ex- 

 pressed by Waller's law, is interfered with in various ways. It has been 

 shown that in this region the course of the motor fibres is not constantly 

 in the ventral root. It is not proven that there may not be great varia- 

 tion in difi'erent individuals of the same species. 



Circulatory Changes in Epilepsy. 



Bechterew has succeeded in observing through a pane of glass set 

 in a dog's skull, the hyperaemia accompanying an epileptic attack in- 

 duced by faradizing the cortex or injecting cinchonin into the circulation. 

 (Neurol. Centralhlatt, 1891, 22.) 



Traumatic Injuries to the Brain. 



I. Coal miner. Injury due to falling stone. Depressed fracture of 

 parietal. Aphasia, deviation of mouth and tongue to the right, motor 

 powers of right arm and leg impaired. Operated by trephining. Inner 

 table found more extensively fractured. Prompt recovery. Lancet, Feb. 

 13, 1892. 



1. Archiv. f. Aiiat. u. Phys. 1887. 



2. Prager Med. Wochensch., 1885. 



3. Beltraege zur Anatomie des Centralnerven .systems, insbesonderes des Rueken- 

 markes. Denkschriften der Kais. Akad. d. Wissenscliaften, LVII. p! 569. 



4. Arch. f. Auat. u. Phys. 1887. 



