Abstract
Summary (1) During sedimentation blood is found to exhibit three phases, the first and last of which are incalculable. The phase of maximum velocity—the middle phase—is found to bear an exponential relationship to the amount of agglutinating substances (called ‘sedimentin’ for short) in the plasma. (2) Standard ‘one-hour-reading’ techniques are evaluated from the standpoint of maximum velocity determination, and are all found wanting in that all include at least one of the two incalculable phases. Short-column techniques are apt to include both first and last phases to the exclusion of the important middle phase of maximum velocity. (3) A tentative plea is made for the determination of maximum velocities even though the technique require multiple observations during the test ; and suggestions for further research are put forward.
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