PLATE V 



C.f' 



V 



) 



FAG 



■*" 



Fig. I. — Diagram of vertical section through the brain of a new-born child stained by the 

 Weigut-Hsematoxylon method to show myelination of the fibres. 



All the parts which are dark contain myelinated fibres. Attention is particularly directed to the staining 

 about C.F., the central fissure which corresponds to the tactile-motor area. It will be observed that 

 the remainder of the cortex is unstained. M.O. medulla oblongata; P.V. pons varolii; O.M.N. 

 oculo-motor nerve; O.C. optic commissure; F.A.C. frontal association centre; C.C. corpus 

 callor.um ; C.F. central fissure; P. A.C. posterior association centre; Y.S. visual sphere; C. 

 cerebellum ; S.C. spinal cord. 



C F 



F.A.C" 



Fig. 2. — Diagram of vertical section of the brain of a child of five months. 



The greater part of the brain now shows, by the staining, myelination of the white matter, thus indicating 

 functional activity of the association centres. F.A.C. frontal association centre ; C.F. central fissure ; 

 P. A.C. posterior association centre ; V.S. visual sphere ; C. cerebellum. It will also be noted the 

 corona radiata and internal capsule which were not myelinated in fig. i ate now myelinated, as 

 shown by the staining in the basal ganglia 



3°S] 



