. The Viscosity of the Blood. Pressure. (corr.)., Time ofoutflow. *?• Pressure(corr.). Time ofoutflow. rn- Plasma. + 3*6 x 106 corpuscles per cubic millimetre. Cm. Hg. Sees. units. Cm. Hg. Sees. i units. 15-613-511-3 8-04-62-6 22-827-433-447*280*3141*7 0 -01380-01430 -01450-01450*01420 -0139 12-810-1 7-75*0 2-2 65-885-0112 168 410 0 -03320 -03380 -03420-03320-0347 + 6 x 106 corpuscles per cubic millimetre. + 9*6 x 106 corpuscles per cubic millimetre. 16-0 14-4 10-4 7*3 85*0 95*2 134-0 188-0 0 -05380 -0550 .0 -05520 -0545 17*6 15-6 10-8 8-2 5-6 138-0158-0229-4306-0306-0 0 -09640
. The Viscosity of the Blood. Pressure. (corr.)., Time ofoutflow. *?• Pressure(corr.). Time ofoutflow. rn- Plasma. + 3*6 x 106 corpuscles per cubic millimetre. Cm. Hg. Sees. units. Cm. Hg. Sees. i units. 15-613-511-3 8-04-62-6 22-827-433-447*280*3141*7 0 -01380-01430 -01450-01450*01420 -0139 12-810-1 7-75*0 2-2 65-885-0112 168 410 0 -03320 -03380 -03420-03320-0347 + 6 x 106 corpuscles per cubic millimetre. + 9*6 x 106 corpuscles per cubic millimetre. 16-0 14-4 10-4 7*3 85*0 95*2 134-0 188-0 0 -05380 -0550 .0 -05520 -0545 17*6 15-6 10-8 8-2 5-6 138-0158-0229-4306-0306-0 0 -09640 -09720 -09840 -09980 -1079 With very fine tubes and long times of outflow it may be mentioned that thesegregation of corpuscles at the bottom of the viscosimeter is liable to causeannoying irregularities, involving frequent repetition after the blood has beenwell mixed by gently bubbling a slow stream of air through it. From thecurves of fig. 9 which, it will be noticed, are practically rectangular 20 bo £ o .Sio i. 3 £. 200 300 Time of outflow. 400 sees. 500 Fig. 9.—-Curves showing the Relation between Outflow Times and Pressures with varying amounts of Corpuscles. hyperbolas of decreasing curvature, some interesting inferences may bedrawn. The outflow times of fig. 9 have been plotted as abscissae and the 1906.] The Viscosity of the Blood. 351 pressures as ordinates. Over the present range of pressures it will be seenthat a small change of pressure at, , 10 cm. Hg, will cause a greaterdiminution of the outflow time for Mood poor in corpuscles than for bloodrich in corpuscles and, as a consequence of this, in the human circulatorysystem we should find such changes producing a much more rapid return ofthe arterial blood to the heart. Further reference will be made to thispoint, however, in the subsequent discussion of the bearing of this andforegoing results on the disorders of the circulatory system. Below about5 cm. pressure the curves would seem to indicate that t
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