“…Every human being — except a baby — needs to eat some indigestible material as a stimulant of the larger bowel to healthy activity. For most people this is found in the fibres of green food and fruits. …”

“…It shares the duty of the lungs in keeping the blood-stream pure; and, further, when healthily active responds to changes in temperature and allows the blood to come to the surface or to retire to the interior of the body, and thus to become cooled or kept warm as the necessity arises. …”