Abstract
INTRODUCTION The close functional and anatomic relationship between the heart and lungs is well recognized. Disturbance in the normal functions of the lungs may have considerable importance in diseases of the heart and blood vessels. Occasionally, respiratory changes are the first recognizable signs of circulatory failure. It is partly for this reason that, in the past, the respiration has been studied carefully with the aid of a number of technical devices. The excursions of various parts of the thoracic wall have been registered. Similarly, volumetric measurements of the ventilation have received careful consideration. Through the earlier investigations of Bergeon and Kastus, 1 Rosenthal, 2 Gad, 3 Ewald 4 and Gevers-Leuven, 5 and through the more recent studies of Pech 6 and Beyne, 7 it has become an established fact that the velocity of the respired air is also of considerable importance in the mechanism of the respiration. Recently, Fleisch 8 described an apparatus which registers the velocity curve
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