. On Cerebral Anaemia and the Effects Which Follow Ligation of the Cerebral Arteries . convolution excited. Movements of advancement of the fore limb and drawing up of the hind limb are at once obtained. The strength of current employed is distinctly perceptible to the tongue. The cerebrum is next entirely removed ; the extensor tonus not only persists, but is intensified. JUog II. Repetition of Experiment I. with like results. Bonnet Monkey ICarotids clamped. Extensor carpi radialis recorded. 3 minims absinthe injected. Fig. 11.—Bonnet Monkey. Ether. Extensor carpi radialis recorded. in m. c7
. On Cerebral Anaemia and the Effects Which Follow Ligation of the Cerebral Arteries . convolution excited. Movements of advancement of the fore limb and drawing up of the hind limb are at once obtained. The strength of current employed is distinctly perceptible to the tongue. The cerebrum is next entirely removed ; the extensor tonus not only persists, but is intensified. JUog II. Repetition of Experiment I. with like results. Bonnet Monkey ICarotids clamped. Extensor carpi radialis recorded. 3 minims absinthe injected. Fig. 11.—Bonnet Monkey. Ether. Extensor carpi radialis recorded. in m. c70 _ imwd i jwir u ihj will! hhhhhhh mhhhhhnr 20 C(i l— m_/~ ^ ^ \ \i CO. Carotids clamped and 3 minims absinthe injected intravenously. T. Tonic extensor Carotids loosened, relaxation of tonus. CL. Commencement of clonic convulsions. EFFECTS WHICH FOLLOW LIGATION OF THE CEREBRAL ARTERIES. 109 Extensor tonus and laboured respiration result. On loosening the carotids clonicconvulsions ensue. On clamping the carotids the clonus ceases. Fig. 12.—Continuation of Fig. CC. Carotids clamped, followed by cessation of clonus. CO. Carotids loosened, followed by a second clonic fit, and this was also cut short after clamping the carotids at CC. Rhesus Monkey, IIRepetition of Experiment I. with like result. Conclusions. (1.) From these experiments it is clear that clonus of rapid tempo is cut out ofabsinthe fits when the circulation of the blood through the cortex cerebri is almostentirely stopped. (2.) The experiments prove how profound becomes the anaemia of the cortex afterligation of the two carotids in monkeys and of the four cerebral arteries in cats, andyet in this condition of intense anaemia the cortex is excitable and even hyper-excitable. In dogs the cerebral circulation, as has been abundantly proved, remainsmore efficient after ligation of the carotid and both vertebral arteries. In this connection I quote an analogous experiment of Cyon.# Engaged inestabli
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