850 MR HAROLD AXEL HAIG ON THE 
alone appeared to give the best results. The Weigert-Pal method was given a trial, 
but with negative results, owing to the special means of preservation and hardening 
employed.* The following regions were studied histologically :— 
(a) Mid-lumbar, dorsal, and cervical regions of the spinal cord. 
(b) Medulla oblongata : 
i. In the region of the pyramidal decussation. 
i. At the lower level of the olivary body. 
i. At the middle of the olivary body. 
iv. At the upper level of the olivary body. 
(c) Pons, lower, middle, and upper regions. 
(d) The mesencephalon : 
i, At the level of the posterior corpora quadrigemina. 
iu. At the level of the anterior corpora quadrigemina. 
(e) The optic thalamus. 
(f) The motor region of the cortex of the cerebral hemispheres (precentral gyrus). 
(g) The cerebellar vermis (mesial region). 
(k) The optic chiasma. 
(1) The pitwetary gland. 
(k) The uncinate gyrus of the hippocampus major. 
I. HistoLogy oF THE SPINAL Corp. 
A. Cervical Region. (Text-fig. 1.) 
A transverse section across the upper region of the cervical cord shows a very 
marked breaking up of the grey matter into four main groups in each half, viz. :— 
(a) A posterior mass extending from the posterior grey commissure into the 
posterior median column of Goll; in this mass at the base small nerve-cells 
are seen, and a few at the peripheral part near the surface of the cord. The 
latter represent the beginning of the nucleus ee which soon becomes 
prominent even in the cervical region. 
(b) A postero-lateral mass, into which the fibres of the Sssiaiibe roots may be seen 
to extend. In this mass small nerve-cells may be made out, but they are 
very scattered and not at all conspicuous. 
(c) An intermedio-lateral mass, at the central portion of which some large nerve- 
cells are to be made out, these representing the cells of Clarke’s column. 
(¢) An anterior mass (anterior cornu) of wide extent, and possessing four or five 
groups of very large nerve-cells (motor cells of anterior cornu). 
* The pituitary gland sections were stained with Delafield’s haematoxylin, followed by eosin to differentiate. 
