Literary Notices. ciii 



gion, i.e., the entrance of blood is obstructed; the exit by the bony 

 transverse sinuses remains open. 



29. The venous pressure in the superior longitudinal sinus rises 

 when the "bag" is distended, i.e., the exit is obstructed by the 

 cannula, and blood is forced out of the tributary veins into the sinus. 



30. The normal venous pressure in each case at once returns 

 when the bag is emptied. 



The capacity of the intra-cranial cavity can be diminished by the 

 introduction of a foreign body into the subdural space. The first 

 effect of the diminution is to expel the cerebro-spinal fluid. After its 

 disappearance, further diminution of the space can only take place 

 by equal diminution of the volume of the intra-cranial blood vessels, 

 particularly of the veins and capillaries. The restriction or arrest of 

 the cerebral circulation thus produced is the efficient cause of the physio- 

 logical disturbance observed after diminution of the intra-carnial cavity. 



In the animals experimented on, any considerable increase of the 

 intra-cranial pressure above the normal (about 10 mm. mercury) inter- 

 feres with or arrests the cerebral circulation. 



On driving salt solution coloured with methyl blue into the sub- 

 dural space at the rate of 1 c.c. a minute, the urine which was col- 

 lected from one ureter became of a blue colour in from 15 to 30 

 minutes. On post-mortem examination, the upper portion of the first 

 lymph gland in the cervical chain was found to be coloured blue ; in 

 the central nervous system the blue colour was found limited to the 

 cerebral hemisphere on the side of injection, the base of the brain, 

 and the cervical region of the cord. Conclusion — The blood vessels 

 form the pathway of absorption of fluid from the subdural space. 



Functions of the Cerebellum. 1 



The results detailed refer chiefly to dogs, but the effects of sim- 

 ilar lesions of the cerebellum in monkeys are contrasted with these. 

 The question as to whether the cerebellum exerts any trophic influ- 

 ence is separately considered, as is a case of defective development of 

 the cerebellum in a cat. 



The investigation of the excitability of the two cerebral hemi- 

 spheres, as tested by the induced current, yielded results of more 

 than ordinary interest, for, whereas the excitability was equal on the 

 two sides when the cerebellum was intact, the opposite hemisphere 



'Russell, J. S. Risien. Experimental Researches into the Functions of 

 the Cerebellum. Proc. Roy. Soc, LV, 331. 



