399 
191 0—1 1 .] Topography of Cerebral Cortex of Guinea-pig. 
Ziehen (22), in a study of the comparative anatomy of the cerebral 
convolutions, criticises several of the views expressed by Turner in his 
paper (21). Special attention is given in this article to the convolutions 
in the brains of the bear and walrus. 
Baginsky (24) contributes an interesting paper on cerebral localisation 
with special regard to the centre for hearing. 
Bechterew (25) discusses the question of the so-called motor zone, 
being in reality sensori-motor. Work on the ape is quoted in support of 
this latter view, and attention is called to clinical cases which strongly 
suggest that in man the motor and sensory functions are closely united. 
Bechterew (26) describes the localisation in the occipital lobe of the 
ape of two centres associated with dilatation and contraction of the pupil. 
Gustav Mann (27) describes in detail the homoplasty of the brain in 
rodents, insectivores, and carnivores. In the brain of the rabbit he is able, 
by means of electrical stimulation, to locate centres for movement of limbs, 
head, neck, eye, and facial muscles. These centres he finds lie in the 
posterior half of the brain ; the centre for the hind limbs lying close to 
the middle line, and posterior to the other centres. 
Wesley Mills (28) gives an account of an investigation made by him 
on cerebral localisation in the rabbit, cavy, rat, and bird. As a result of 
his work on the cavy, he decides that the motor areas are not well defined 
although he is able to describe centres for all movements except those of 
the hind limbs. 
Cunningham (29) describes the motor areas in the cerebrum of the 
opossum, which he finds lie in the anterior half of the cerebral hemisphere. 
He fails to find a satisfactory centre for the hind limb. 
Martin (30), who examined the cerebrum of the ornithoryhnchus, finds 
the motor areas in the anterior half of the brain, but describes no centre 
for the hind limbs. 
Elliot Smith (31) gives a description of the brain in monotremata, and 
draws comparisons between the cerebral cortex in monotremata, marsupialia, 
insectivora, and other orders. 
Bechterew (32) discusses the question of the localisation of the auditory 
centre. A considerable part of the paper is devoted to a resume of the 
most recent work on this point. The work of LarinofF is described in 
considerable detail. He worked on dogs, and localised the centre in the 
first and third temporal convolutions with subsidiary centres associated 
with the appreciation of different tones. 
Yonakow (33) gives an interesting resume of work on the question of 
cerebral localisation. 
