42 Journal of Comparative Neurology. 



the infracortical ganglions/ After the removal of a cortical 

 area of the parietal lobe, the lateral nucleus of the thalamen- 

 cephalon was remarkably atrophied ; after the removal of a re- 

 gion from the occipital lobe corresponding to Munk's area A, 

 in the dog, the external geniculate body was found atrophied, 

 and the internal geniculate body was shown to have the same 

 relation to Munk's area B, (the auditory sphere). 



V. Monakow arrives at the following conclusions based on 

 a great number of experiments : 



1. The extirpation of limited cortical areas in the new- 

 born rabbit invariably causes a limiled degeneration of the tracts 

 depending on them, no matter what their physiological signifi- 

 cance may be. 



2. As a rule every single cortical area is in distinct con- 

 nection with more than one tract of fibres. 



3. Every nucleus of the thalamencephalon, as well as the 

 external and internal geniculate bodies is distinctly connected 

 with a limited cortical area. 



4. The external and internal geniculate bodies are analo- 

 gous to the nuclei of the thalamancephalon, and ought to be 

 classified with them. 



Subsequently, v. Monakow began to pay special attention 

 to the optic apparatus. One of the papers published in 1883,"^ 

 initiates a series of contributions, by which he has done so 

 much to elucidate the anatomy of the parts concerned, and at 

 the same time to furnish material of great theoretical and 

 histological importance. These studies were taken up and 

 treated in a more elaborate form later on, and have been 

 brought to a certain conclusion in a new series of contributions 



^ Ueber einige diircli Lxlirpation circumscripter Hirnrindenregionen be- 

 dingte Entwicklungshemmungen der Kaninchen Gehirns. von Dr. med. C. v. 

 Monakow, Assistentarzt in St. Pirminsberg (Schweiz). Archiv. fuer Psychiatric, 

 Vol. XII, pp. 141-156 and 535-549- plates TI and IX. 



''■ Experimentelle and pathologisch-anatomische Untersuchungen iiber die 

 Bezeichungen der sogenannten Sehsphaere zu den infracorticalen Opticuscentren 

 und zum N. opticus, von Dr. v. Monakow, II. Arzt in St. Pirminsberg 

 (Schweiz). Arch. f. Psych. Vol. XIV, pp. 699-75 1, Plate IX. 



