The Motion of the Blood.
THE most Renowned and most Learned Physician, Doctor Harvey, hath found out the Circulation of the Blood, by his industrious study, so methinks it should be very beneficial to∣wards the health of Man, to find out the Motion of the Blood, as it runs, whether it hath one intermixing Motion as it runs; or whether the Blood doth not do as the Water seems to do, which going in a swift source, where the following Drops are as great Strangers to the leading Drops, as the situation of either Pole: for though the hinder Drops press forwards, and drive on the former, like Crouds of People, one shuffling another, yet they do not seem to intermix, or incorporate, but rather seem to break, and divide into parts; for if they should intermix, and incorpo∣rate one drop into another, their intermixing Motion would hinder their running Motion so much, as it would be scarce per∣ceivable how it went forward; and if the Blood do not inter∣mix, then some Veins may have foul and corrupted Blood, and some very pure Blood, which we many times see; which makes me think it doth not intermix; if so, we may take out our good Blood, and leave our bad behind us, not knowing where the Corrupted Blood lyeth; and this Corrupted Blood may infect the Vital Parts, as it runs along. This makes some, that when they let Blood in Feavers, they are never the better, because that Vein was not open where it lay: so that Physicians had better strike two or three Veins, and venture the loss of Good Blood, than miss the Bad, for it may corrupt all the rest, though not by intermixing, yet by corrupting the Liver as it floweth.