Secondary Degeneration following Unilateral Lesions etc. 31 1 



on to the floor they always fell over on the right shoulder. This 

 defect in walking- and jumping soon disappeared and within a week, 

 as a rule, no lameness could be detected. 



Inability to perform purely voluntary, isolated or unassociated 

 movements persisted much longer, and in several cases this power was 

 not restored before the animals were killed, but in most of the cases 

 where there was a powerful incentive, purely voluntary movements 

 could be performed. If, for example, while food was presented to a 

 cat it was prevented from getting at it with its month or left fore- 

 paw it would stretch out and catch the food with its right (para- 

 lysed) paw. Under ordinary circumstances, however, it preferred to 

 use the left paw. 



The effects on sensation varied greatly. Tactile sensibility was 

 absent at first in eight of the cases; it was present, but delayed, in 

 two cases; in four cases it did not seem to be interfered with, while 

 in one case there was slight and in another distinct hyperaesthesia 

 on the right side, — the slightest touch of a needle was perceived 

 more readily on the right side than on the left, although the motor 

 paralysis was as marked in these as in any of the other cases. The 

 sensory paralysis passed off much earlier than the motor paralysis, 

 most frequently lasting only three or four days after the operation. 

 In four cases, while the light touch of a needle was felt on both 

 right limbs, the "clip-test" called forth no response on the paralysed 

 side, so that if one had judged by this test alone, one would have 

 come to the conclusion that these animals did not feel tactile impres- 

 sions. The cold-water test was applied in thirteen cases, and in 

 eight of these there was response at once, while in the other five 

 ice-cold water did not appear to be felt. As is well known, cats are 

 particularly sensitive to cold water applied to their feet. In every 

 case there was reaction to hot water (57° C. — uncomfortably hot 

 for the hand), but often only after a delay of several seconds, and 

 then the animal would appear suddenly to feel it to be very painful. 

 When either hot or cold water was applied to the feet on the left 

 side they were instantly withdrawn, but water at 57^ C. did not seem 

 to cause pain as it did on the right side. The knee-jerk was usually 



