Pig. 55. The region immediately dorsal to the aqueduct of 

 Sylvius, showing the disposition of the neurones of the roof- 

 nucleus. Methylen-blue, * 89. 



Fig. 56. Neurone frorr the left half of the midbrain roof- 

 nucleus. The Nissl TetLod, " 900. 



Pig. 57. Neurone from the roof-nucleus of the^midlrain, 

 right s id e, toge t her with a part of the stratum medullare pro- 

 fundus. Two fibres are seen to eirerge from the stratum to end 

 in arborizations near the neurone. Iron haematoxylin staining. 

 Outline x 496; details from the homogeneous immersion. 



PLATE VIII. 



?ig.58. Midbrair. Sagittal section through the nuclei 

 of the oculomotor and trochlear nerves. Methylen-blue, * 89. 



Pig. 59. Neurone from the nucleus of the III nerve. The 

 tigroid masses ir. the region of the nuclear membrane are re- 

 markable for their large size. The Nissl method, * 900. 



Fig. 60. Neurone from the nucleus of the IV nerve. The 

 Nissl method, x 1120. 



Pig. 61. Ependyma from the optic lobes. The ependymal 

 fibres are represented to the boundary of the central gray 

 matter, only; see Pig. 21 for the entire fibre. Combination 

 of iron haematoxylin and methylen-blue staining, * 1120. 



Pig. 62. Interbrain. Two neurones from the nucleus strati 

 grisei of the thalamus. The Nir. si method, " 1120. 



Pig. 6 3. A characteriftic group of neurones from the nucleus 

 geniculatum of the thalairus. The Nissl method, x 1120. 



