Sedimentation of Blood Corpuscles

I HAVE noticed lately that if oxalated or defibrinated Wood is put to stand in narrow tubes, the corpuscles sediment a good deal faster if the tube is inclined than when it is vertical. Thus with tubes about 2.7 mm. internal diameter there were, after 20 hours, 4, 23, 35, and 42 per cent of clear serum with tubes inclined at 0°, 221/3°, 45°, and 671/2° respectively. In another rough experiment with tubes of different diameters, all filled to a height of 40 mm. with diluted blood, after 5 hours there were the following proportions of clear serum:—