THE CIRCULATION OF THE BLOOD 



689 



Fig. 235 is a copy of a picture by Lhermitte in the Luxembourg Gallery in Paris 

 .laude Bernard is shown demonstrating to friends and pupils this effect on the 

 ear of the rabbit ; at least, this appears to be the nature of the experiment At 

 a later date (1858) Bernard proved the existence of vaso-dilator nerves by 

 stimulating the chorda tympani nerve, and observing the greatly increased 

 outflow from the vein of the submaxillary gland. The reader may, perhaps, find 

 1 ig. 236 ot interest in connection with the great physiologist 



Most of the organs of the body have been shown to have a supply of both vaso- 



'sn>m^t/s cJ 



SIGNATURE OF CLAUDE BERNARD. 



(From a reprint sent to Carl Ludwig.) 



402^ i. * 



PJ f 



FIG. 236. STATUE OF CLAUDE BERNARD IN PARIS. 



constrictor and vaso-dilator nerves. Fig 

 produced in the tongue of the dog by & th 

 produced by the cervical sympathetic nerve. FigT 109 

 figure by Retzius of the nerve plexus around arterioles 



Although nearly all the organs of the body are thus supplied with vasomotor 

 nerves, it is remarkable that no experimental evidence of a satisfactory nature 

 has been brought to show their presence in the brain (see Bayliss and Hill 95) 

 ; appears that the central nervous system is of such importance that when 

 more blood is required by it, this blood has to be provided by rise of 

 pressure, produced by vaso-constriction in the rest of the organism. 

 44 



