CONTENTS. 



CHAPTER I. 



BIOLOGICAL INTRODUCTION. 



PAGE 



Algae i 



Fungi, 4 



Protozoa, 5 



Ciliary motion, 9 



Effect of CO 2 on ciliary motion, n 



CHAPTER II. 



MUSCLE-NERVE PHYSIOLOGY. 



Study of electrical apparatus, 13 



Interrupters, 18 



Dissection of frog's thigh and leg, 18 



Elasticity of muscle, 20 



Irritability of nerve and muscle to various stimuli, 22 



Period of latent stimulation and form of the single twitch, .... 23 



Velocity of the nerve impulse, 24 



Influence of load on muscle twitch, 25 



Influence of fatigue on the form of the twitch, 26 



Volume of contracting muscle, 28 



Summation of contractions and genesis of tetanus, 29 



To determine actual shortening of contracting muscle, 31 



Work done by contracting muscle, 31 



Fatigue of human voluntary muscle, . . 31 



Influence of tension on muscle contraction, 32 



Electric phenomena of muscle and nerve, 34 



Irritability and conductivity of nerve and muscle during and after the 



passage of a constant current (electrotonus), 38 



The constant current as a stimulus (Pfliiger's laws), 41 



Stimulation of human nerves, 42 



Reaction of degeneration, 44 



[v] 



