192 QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 
These cells, like those of the anterior centre, are arranged in 
groups of two or three. This centre Betz believes to be a 
“sensory centre.” ‘The two parts of the hemisphere would 
then be analogous to the two parts of grey matter of the 
spinal cord ; all in front of the fissure of Rolando corre- 
sponding to the anterior cornua; the part behind this fissure 
(with the temporal lobe) to the posterior cornua. This 
parallel is further developed. 
4. Minute Anatomy of the Cerebellum.—Golgi (abstract in 
‘Centralblatt,’ 1874, p. 694) has obtained remarkable 
results by the application of a new method to the investi- 
gation of the cerebellum. The molecular (grey or external) 
layer of the cortex of the cerebellum contains a system of 
nerve-fibres not yet properly appreciated in its anatomical 
connections or its importance, which must be regarded as 
prolongations of those which exist in the granule-layer 
(rusty brown or internal layer). They exist in every part 
of the molecular layer, but more conspicuously in its inner 
half, or even its inner third. The stouter fibres belonging 
to this system run parallel to one another, and for a con-~ 
siderable distance, some being traceable round the whole of 
one cerebellar convolution. Other characteristics of this 
system of fibres are —(1) Branches which during the whole 
course of the fibres are given off towards the centre and 
towards the periphery. (2) The mode of giving off these 
fibres, which leave the trunk either at right angles or 
almost at right angles. (3) The main fibres are mntually 
connected, either by short intermediate branches or directly. 
(4) The course of the fibres prolonged and complicated by 
extraordinary loops, twists, spirals, and knots. This is more 
especially the case in the inner portion of the grey or mole- 
cular layer. 
A dense mass of nerve-fibres exists at the boundary of the 
molecular and granular layer, some single, some in bundles, 
which pass into the molecular layer and then enter 
into communication either with the fibres of that layer 
or with the small ganglionic cells which are found there. 
These fibres all give off branches, and thus form an extremely 
complicated system. ‘The number of such ganglionic cells 
contained in the grey or molecular layer Golgi finds to 
be very great. They are scattered through this layer from 
the large ganglionic cells of Purkinje to close under the 
pia mater. Their size isabout 6—12 mm. diameter, theirshape 
irregular ; each is furnished with four or five protoplasmic 
processes, and one so-called axis-cylinder process, which re- 
sembles the axis-cylinder process of the pyramidal cells of the 
