STUDIES ON THE CIRCULATION

Abstract

I. Evidence is presented showing that it is possible to calculate accurately the flow of water through a system of tubes and bulbs, simulating the cardio-vascular apparatus of animals. The calculation is based upon the av. concentration and time relations of consecutive samples of the stream into which a dye has been injected. These samples serve equally well whether taken through large or small needles or from large or small branches of the stream. Curves obtained in experiments in which the water recirculates are similar to those in animal experiments. The confusion introduced by re-circulation is avoided by plotting the curve on semi-logarithmic paper. The descending limb of the primary wave is then a straight line and when prolonged serves to differentiate once-circulated from twice-circulated dye.