If blood be
removed or if it escape in any considerable quantity, animals fall
into a faint or swoon; if it be removed or if it escape in an
exceedingly large quantity they die. If the blood get exceedingly
liquid, animals fall sick; for the blood then turns into something
like ichor, or a liquid so thin that it at times has been known to
exude through the pores like sweat. In some cases blood, when
issuing from the veins, does not coagulate at all, or only here and
there. Whilst animals are sleeping the blood is less abundantly
supplied near the exterior surfaces, so that, if the sleeping creature
be pricked with a pin, the blood does not issue as copiously as it
would if the creature were awake. Blood is developed out of ichor by
coction, and fat in like manner out of blood. If the blood get
diseased, haemorrhoids may ensue in the nostril or at the anus, or the
veins may become varicose. Blood, if it corrupt in the body, has a
tendency to turn into pus, and pus may turn into a solid concretion.