1889.] On the local Paralysis of Peripheral Ganglia, fyc. 423 



The appearance of the hydrogen lines at the maximum and their 

 disappearance as the stars fade will no doubt eventually be found to 

 be among the characteristic variations of the spectrum which accom- 

 panies the variation of light in stars of this class. 



VI. Conclusion. 



As far as Group II is concerned, I think it will be granted that 

 the meteoritic theory of variability is quite in harmony with the 

 facts observed, considering that the observations are still incom- 

 plete. The theory does not require that all the swarms of the 

 group should be variable, but only those which are condensing 

 double or multiple nebulas. At the same time it requires that this 

 group should be more subject to variability than any of the others, 

 and this is one of the best established facts of modern astronomy. 

 Not only are these general demands satisOed, but the theory bears 

 the strain put upon it when it is used to explain the finer details, as 

 I have shown in this paper. 



III. " On the Local Paralysis of Peripheral Ganglia, and on the 

 Connexion of different Classes of Nerve Fibres with them." 

 By J. N. Langley, F.R.S., Fellow of Trinity College, and 

 W. Lee Dickinson,. M.R.C.P., Cains College, Cambridge. 

 Received September 7, 1889. 



Hirschmann* has shown that after a moderate dose of nicotin 

 stimulation of the sympathetic nerve in the neck causes no dilation 

 of the pupil. He concludes that nicotin paralyses the endings of the 

 dilator fibres in the pupih 



In the course of some observations on the physiological action of 

 nicotin, we had occasion to repeat Hirschmann's experiment ; we 

 found in the rabbit that 30 to 40 mgrms. of nicotin injected into a 

 vein stopped the effect of stimulating the sympathetic in the neck, 

 not only on the pupil, but also on the vessels of the ear. A paralysis 

 of the vasomotor fibres of the sympathetic had been suggested by 

 Rosenthal,t on the ground that nicotin causes a state of congestion in 

 the vessels of the ear of the rabbit. 



Since we had been much struck with the profound action of nicotin 

 upon the central nervous system, and since it had seemed to one J of 

 us in some previous experiments with atropin that the secretion of 

 saliva from the sub-maxillary gland of the cat failed earlier on stimu- 



* Hirschmann, ' Arch. f. Anat. u. Physiol.,' 1863, p. 309. 



f Rosenthal, ' Centralb. f. d. Med. Wissenschaften,' 1863, p. 737. 



% Langley, ' Journal of Physiology,' vol. 1, 1878, p. 89. 



