CONTENTS xvii 



PAGE 



from dotted record — Significance of down and up movements 

 — Systole and diastole — Table showing rates of movement of 

 Desmodium leaflet at different phases .... 290 



CHAPTER XXII 



EFFECT OF HYDROSTATIC PRESSURE, LOAD, AND LIGATURE 

 ON THE PULSATION OF DESMODIUM 



Effect of internal hydrostatic pressure on the pulsation of Desmo- 

 dium — Expansive erection of leaflet under increased pressure ; 

 diminution of the extent of systolic contraction — Effect of 

 load : diminution of period — Stannius' ligature on heart-beat 

 — Parallel effect of ligature on pulsation of Desmodium — 

 Arrest of pulsation by a cut and revival by electric shock . 300 



CHAPTER XXIII 



EFFECT OF STIMULUS ON LEAFLET OF DESMODIUM 

 AT STANDSTILL 



Condition of standstill brought about by depletion of energy — 

 Renewal of pulsation by the stimulus of light — Response to 

 stimulus of induction-shock — Multiple response under tetani- 

 sation — Determination of the latent period and the apex time 

 — Refractory period — Effect of stimulus on leaflets in sub- 

 tonic condition — Effect of isolation on rhythmic activity — 

 Gradual arrest of pulsation resulting from run-down of stored 

 energy — Effect of fresh accession of energy . . . 306 



CHAPTER XXIV 



EFFECT OF ELECTRIC STIMULATION ON THE PULSATION 

 OF DESMODIUM GYRANS 



Effect of electric shock on Desmodium leaflet — Incapability of 

 tetanus — Extra pulsation induced by electric shock — Relative 

 effectiveness of electric stimulus at diastolic phase — Effect of 

 transmitted excitation on normal pulsation of heart and 

 on pulsation of Desmodium leaflet — Effects of acceleration 

 and inhibition ........ 318 



