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H. E. JORDAN AND K. B. STEELE 



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All figures unless otherwise specified are magnified 1800 diameters. 



Fig. 1 Expanse of cardiac muscle of monkey in longitudinal section, showing 

 several types of intercalated discs, their general disposition in the axis of the mesh; 

 and their relation to each other, the dark bands, and the myofibrillae. 



Fig. 2 Longitudinal section of two medially fused muscle trabecular of mon- 

 key heart, showing the axial disposition of the discs, and the super-nuclear loca- 

 tion of several. 



