GALL BLADDER. 155 



5. Bile-salt and amyl nitrite injected intravenously cause relaxation 

 of the muscular wall of the gall-bladder; a similar effect is produced 

 by atropine. 



Pilocarpine and peptone cause an apparent contraction of the gall- 

 bladder, but this is solely due to the mechanical effect of swelling of the 

 liver. Neither of these drugs appears to have any effect on the gall- 

 bladder itself. 



6. Anaemia, caused by compression of the thoracic aorta, produces 

 a rapid fall in the tone of the muscle of the gall-bladder. 



