x CONTENTS. 



PAGE 



54. Minute structure of muscular fibre; nature of striation ... 90 

 55. The visible changes which take place in a muscular fibre during a 



contraction 93 



56. The appearances presented when the fibre is examined with polarized 



light 95 



57. Nature of the act of contraction 96 



The Chemistry of Muscle. 



58. Contrast of living and dead muscle ; rigor mortis .... 97 

 59. Chemical bodies present in dead muscle; myosin, syntonin . . 98 

 60. Chemistry of living muscle; muscle-plasma, muscle-clot and muscle- 

 serum, myoglobulin, histo-haematin 100 



61. Acid reaction of rigid muscle; development of carbonic acid in rigor 



mortis 101 



62. Other constituents of muscle 103 



63. Chemical changes during contraction ; development of carbonic acid 



and acid reaction 105 



64. Summary of the chemistry of muscle 106 



Thermal Changes. 



65. Heat given out during a contraction. Comparison of muscle with a 



steam-engine . . 106 



Electrical Changes. 



66. Non-polarisable electrodes. Muscle currents ; their distribution and 



nature 108 



67. Negative variation of the muscle current; currents of action. The 



rheoscopic frog 113 



The Changes in a Nerve during the passage - of a Nervous Impulse. 



68. Structure of a nerve. Primitive sheath or neurilemma, medulla, axis- 

 cylinder, nodes of Kanvier. The axis-cylinder the essential part 115 

 69. Nerve endings in striated muscular fibres. Henle's sheath. End- 

 plates 120 



70. Non-medullated nerve fibres 122 



71. The chemistry of a nerve; cholesterin, lecithin, cerebrin, protagon . 123 

 72. The nervous impulse; the electrical changes accompanying it. These 



changes travel in both directions along the nerve . . . 125 

 73. Summary of the changes occurring in a muscle and nerve as the 



result of stimulation . . 126 



