102 EXPERIMENTAL PHYSIOLOGY 



known capacity which intermittingly and automatically empties itself 

 by a siphon : each emptying being recorded graphically on the moving 

 smoked paper. 



The above methods may also be used to record the flow of secretions 

 (Chapter XXIV.). 



Lymph-hearts. Place a frog, the brain of which has been destroyed, 

 or which has been decapitated, in the prone position on the frog-cork, 

 and reflect the skin from either side of the urostyle. Notice the 

 pulsation of the lymph-hearts beneath the fascia on each side : 

 usually they do not synchronise. Destroy the spinal cord completely 

 by a wire. The lymph-hearts now cease to beat : their pulsations are 

 dependent on the spinal cord. 



