Iviii Journal of Comparative Neurology. 



ant. corpus quadrigeminum and pons, the mesial part of Burdach's 

 nucleus; GoU's nucleus, and the corpus Luysii (the latter dependent 

 on the corpus striatum). The ganglion habenulse is an exception 

 among the thalamic ganglia, as it does not depend on the existence of 

 the forebrain. All these ganglia send the fibers in fascicles to the fore- 

 brain. After removal of the cerebrum the cells of these nuclei de- 

 generate. 



5. The gray of the cerebral cortex — for the first time presented 

 in a text-book with illustrations of the results of the degeneration- 

 method. 



6. The gray of the forebrain-ganglia. 



7. The gray of the substantia reticularis, characterized by meshes 

 of meduUated fibers. (Here v. Monakow classifies a second time the 

 lateral nucleus, lateral part of Burdach's nucleus, nucleus of Bech- 

 terew; see my remark to i.) 



8. The central gray. 



9. The gray of the cerebellar cortex. 



10. The gray of the olive and the dentate nucleus. 



11. The gray of the solitary cells (of the substantia reticularis). 



12. Unclassified gray. 



This classification gives many sound suggestions. Just as we be- 

 came familiar with the fiber-tracts through their differences of growth 

 and degeneration, so the law governing growth and degeneration of 

 the types of gray matter throws the sparks of life into this step-child 

 of neurology, the gray matter. The silver-method and the cell-stains 

 will greatly help these methods, and they themselves depend ultimately 

 on the degeneration-method more than KoUiker and others will admit, 

 much to the disadvantage of their work. Another view of v. Mona- 

 kow's deserves the heartiest commendation, viz., his emphatic state- 

 ment, that the bundles of fibers composing the white substance are by 

 no means compact strands of one type of fibers, but ahuays mixtures, 

 and objects of greater depth of study than is usually given them. 

 The schematic plan of the architecture on p. 130 deserves special 

 praise because it limits itself to the data which are experimentally es- 

 tablished and leaves out even the best supported conjectures because 

 they are mere conjectures and mentioned as such in the text only. 



The second division of v. Monakow's introduction is devoted to 

 a historical review of the physiology of the cortex, uniting the nu- 

 merous conflicting data under the point of view of phylogenetic de- 

 velopment. It is a splendid expose of the laws of migration of func- 

 tion towards the cortex on an anatomical basis, and the completest 



