Abstract
THE twelfth of the series of short monographs published under the editorship of Profs. Gaup and Nagel is a very able and interesting account of the minute structure of cardiac muscle, by Prof. Dietrich, of Charlottenburg. Perhaps of most value at the moment is his concise and judicious statement of our knowledge of the structure and distribution of the atrioventricular bundle, that complex system of peculiar fibres collecting the whole musculature of the heart under its extended grasp, as if for purposes of coordination. More original and of great interest is his discussion as to the meaning of the transverse lines which are still very generally accepted as limits to those individual cells by the juxtaposition of which the fibres of cardiac muscle are said to be formed. Faith in this view was somewhat shaken when it was found the structural element of major importance, the intra-cellular contractile fibrils, swept through these lines without interruption. More recently this view has been still further discredited by proof of their irregularity of occurrence in relation to the nuclei of the tissue.
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