849 
well as a number of ventra! large cells. This geniculate body is m every respect 
the negative of fig. 5. 
The result of this observation is clear enough: The important defect 
in the occipital lobe above mentioned, was not sufficient to produce 
an atrophy of the dorsomedial division of the lateral geniculate 
body. The cauda on the other hand lost all the cells and fibres. 
From our first observation we learned that the cauda remained 
uninjured, when the focus (s. fig. 6 and fig. 7) totally destroyed the 
dorsal layer of the strata sagittalia. There (according to the spot 
of degeneration in our secend observation in fig. 14) the geniculo- 
cortical radiation from the ventral occipital convolutions is already 
situated dorsally from the cornu inferius. 
Moreover on the same sections in our first observation the ventral 
strata sagittalia are intact, and exactly these are completely missing 
in the second (s. fig. 13). New was to me the exquisite total loss 
of all the cells and fibres, either in the lateral, either in the medial 
half of the geniculate body, as is found in both these observations, 
although I possess many other partial atrophies of it after oeci- 
pital-lesions. . 
Generally spoken, lesions of the medio-ventral occipital convolu- 
tions cause atrophy of the latero-ventral part of the geniculate body, 
but in my cases it has never been a total one. 
As long as the gyrus occipito-temporalis proximally from the cal- 
carine fissure is uninjured, not all the laterally situated fibres dis- 
appear, but cells often remain in the ventral, occasionally also in the 
dorsal layers. ') Only after the knowledge of such extremes as above 
described, I have learned to appreciate the incomplete atrophies. 
Wedges turning their base to the dorsal part of the geniculate 
body, fall out. Their localisation differs by the place of ihe fecus, 
although they never touch the dorso-medial part of it, as long as 
the focus only destroys the ventro-medial occipital convolutions. 
In this way e.g. must be considered the ventral occipital focus 
with atrophy in the cauda of tbe lateral geniculate body, described 
by myself in 1910. At present I complete this observation referring 
to the same figures in order to describe that geniculate body exactly. 
IIT. 
A basal defect in the left hemisphere (s. fig. 17, also Psych. and Neurol. Bladen 
1910, p. 16 more precisely the photos on plate IV and fig 12 on plate V) elimi- 
') Nearly the same can be said of dorsally situated foci (mutatis mutandis) 
which section the optic radiation either close to the geniculate body or further off, 
I shall refer to this later on, 
