288. Ycor: i.e. the wateriness of the blood; Galen says to put a drop of the blood on your fingernail after bloodletting, and, if it flows on the fingernail, the blood is watery, but if it does not flow, this is a good sign as far as the blood goes, but it is not good as regards the maintenance of health, because it indicates the increase of undigested humours in the body,