8. Incrassating or Thickeners of the Humours, are

All things which expel the liquid Parts strongly, so as to thicken what remains. Therefore violent Exercise or Labour produceth this Effect; the Blood of labouring People is more dense than that of the sedenta|ry. A due Consistence of the Blood is very necessary for Health, and this is acquir'd chiefly by Exercise; all Page  262 things which provoke great Secre|tions, especially Sweat, produce this Effect at last.