552 
PROFESSORS D. FERRIER AND G. F. YEO OY THE EFFECTS OF 
the left nostril caused active retraction of the head and a snort or sneeze, whereas on 
the right very little movement was excited. 
The animal, which appeared quite strong on the evening of the second day, was found 
dead on the morning of the third day. 
Post-mortem examination .—On removal of the dressings it was found that a recent 
haemorrhage had occurred filling the left middle fossa, and extending from this to some 
extent over the convexity of both frontal lobes. 
On removal of the brain it was found that the cerebellum, pons, medulla oblongata 
and all the cranial nerves were uninjured. The crura cerebri and corpora quadrigemina 
were intact. The optic tracts were uninjured, and readily traceable to the corpora 
geniculata. 
The brain was everywhere uninjured except in the left occipito-temporal region. 
The inferior temporo-sphenoidal convolution and anterior portion of the inferior occi¬ 
pital convolution had been disorganised by an irregular section which extended 
across the collateral fissure into the outer half of the gyrus hippocampi. The surface 
of the section was ragged and the whole of the inferior temporo-sphenoidal, and outer 
half of the gyrus hippocampi thoroughly disorganised. The inner half of the gyrus 
hippocampi was quite free from lesion, and of a normal aspect on the surface (fig. 141). 
The linomal lobule was intact. 
Frontal sections of the left hemisphere (Plate 32, figs. 143-14S) arranged from before 
backwards, showed that in the region of the nucleus amygdalae (fig. 143) there was a 
superficial lesion of the gyrus hippocampi adjoining the extremity of the collateral 
fissure, penetrating more deeply and dividing the medullary fibres slightly posterior to 
this (fig. 144). Further back (figs. 145 and 146) the lesion had destroyed the cortex of 
the outer half of the gyrus hippocampi, and completely severed the medullary fibres of the 
cornu ammonis, which itself was intact. Still farther back (fig. 147) the cortex of the 
gyrus hippocampi was entirely removed externally, and also the cortex of the inferior 
temporo-sphenoidal region. The cornu ammonis still remained connected with the 
fimbria. At the junction of the posterior and inferior cornua (fig. 148) the lesion gradually 
came to an end with destruction of the cortex on each side of the collateral fissure, and 
partial lesion of the medullary fibres of the base of the cornu ammonis. 
Remarks .— This case, like the two former, was again unsuccessful so far as related 
to the opportunities of continued observation. But it again demonstrates the- 
important fact that destructive lesions implicating only the inferior temporo-sphenoidal 
and hippocampal region cause profound impairment of tactile sensibility, in all its 
forms, without any motor paralysis whatever. 
In this case also there was no appreciable impairment of vision due to the com¬ 
paratively slight, if any, injury to the occipito-angular region. Hearing also was 
unimpaired, and as before, the superior temporo-sphenoidal convolution was entirely 
free from lesion. 
