284 Jol'HNAL OF CoMrAKATl\E NeUROI.OGY. 



Col II III ha //-.■III (nestling); A. O., accesory olives; /-'. u., Fibra; arcuatic; 

 I'/, root of abducens nerve; fV//, root of seventh and eighth nerves. 



Ft'o-: l')-17. Horizontal longitudinal sections of the metencephalon 

 of Coliniilni Uvia: Va, lateral motor fasciculus of the trigeminal nerve; 

 \'h, deep motor fasciculus of do; IV, cervical fasciculus of do; TX, root 

 of ninth nerve; A', root of tenth nerve; '1, deep motor nidulus of the 

 trigeminal nerve; ii, nidulus of the eleventh nerve. 



/■Vi,'. /<s'. Transverse section through the metencephalon of 

 Agckeiis phicniceus, taken through the root of the auditory nerve; }'TI^, 

 tractus d of the seventh and eighth nerves. 



Fio-. UK Cells from the Gasserian ganglion of Hylocichla Sxvaiii- 



SOIIl. 



Fig. ..'IK Diagram illustrating the course of a few of the tracts of 

 metencephalon. No attempt has been made to represent the relative 

 thickness of the tracts; A. C, anterior commissure; A. F., anterior 

 peduncle of the cerebellum; C. C, corpus callosum; C. S., commissura 

 sylvii; I). C, direct cerebellar tract; /-. F., posterior longitudinal 

 fasciculus; F. C, posterior commissure. F. F., pons fibres (these are 

 very few and scattered); /*. A'., peduncular nidulus; F. 7'., pyramidal 

 tracts; 7\ F., tract from the epencephalon (see p. 125); T. T., taenfa 

 thalami. Roman numerals indicate the corresponding nerve niduli. 



Fig. Jl. Diagram illustrating the course of a few tracts of the 

 metencephalon. No attempt is made to represent the relative size of the 

 tracts; C. g., corpus geniculatum externum; c. //., crescent-shape 

 nidulus; c. /., crossed pyramidal tracts; F. F., direct pyramidal tracts; 

 /. C, inferior commissure; M. T'., mesencephalic ventricle; X. p.. 

 nucleus posterious; F. g., prosencephalic tract from the corpus genicu- 

 latum; F. S\\, nidulus pyriformis and nidulus lenticularis; F. f'., 

 prosencephalic ventricle; 7\ B., Tractus Bummi. Roman numerals 

 indicate the corresponding nerve tracts. Arabic numerals indicate the 

 corresponding nerve niduli. 



Fig. ..'J. Transverse section of the brain of Sia/in sia/is. 



Fig. ..'.1. Cells from lateral sensory nidulus of the trigeminal nerve 

 of Colli mini Uvia (nestling). 



Fig. 24. Cells from lateral motor nidulus of the trigeminal nerve of 

 Columha Uvia (nestling). 



BIBLIOGRAPHY. 



The Relative Weight of the Brain to the Body in Birds. The 

 American Naturalist., 1888, p. 537. 



Bechterew, W. Nactrag zu der Arbeit, Ueber die verschiedenen 

 Lagen und Dimensionen der Pyramidenbahn beim Menschen und den 

 Thieren, und ueber das Vorkommenden von Fasern in denselben, 

 welche sich durch eine friihere Entwickelung anzeichnen. Nenrolog- 

 isclics Ccntr alblntt, ]a.\\rga.r\g 10, 1891, No. 4. 



