CONTENTS, 



PAGE 



Introduction 229 



1. Criticism of du Bois-Reymond'a experiments on the gracilis and semimem- 



branostts muscles of the frog. Influence of tendinous intersections on 



' polarisation ' of muscle 231 



2. Experiments on polarisation of a muscle without tendinous intersections 



the sartorius of the frog 241 



