Page:Researches on Irritability of Plants.djvu/17

This page has been proofread, but needs to be validated.
xviii
RESEARCHES ON IRRITABILITY OF PLANTS

CHAPTER XXV

EFFECT OF TEMPERATURE ON RHYTHMIC PULSATION OF DESMODIUM GYRANS

page
Effect of lowering of temperature on rhythmic pulsation of cardiac tissue—Similar effect on the pulsation of Desmodium—Increase of systolic limit during cooling—Minimum temperature for arrest of pulsation—Arrest by cooling and subsequent revival by warming—Increase of diastolic limit during warming—Effect of rise of temperature on the pulsation of frog’s heart—Similar effect on the pulsation of Desmodium—Effect of rise above and return to normal temperature—Diminution of systolic contraction during rise of temperature—Increase of systolic contraction during fall of temperature—Permanent arrest due to heat-rigor
•          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •
323

CHAPTER XXVI

EFFECT OF CHEMICAL AGENTS ON THE AUTOMATIC PULSATION OF DESMODIUM GYRANS

Application of gaseous or liquid reagents—Modifying influence of tonic condition of specimen, strength, and duration of application—Effect of sugar solution—Effect of alcohol—Action of carbonic-acid gas—Effects of anæsthetics, ether, and chloroform—Action of carbon disulphide—Effect of copper sulphate solution—Effect of potassium cyanide solution—Antagonistic actions of acids and alkalis on the pulsations of the heart and of Desmodium—Similarities of reaction in rhythmic tissues animal and vegetal
•          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •
332
GENERAL SURVEY
342
•          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •
361
•          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •
369