The pancreas is a large flat gland situated behind the stomach and reaching from the duodenum transversely towards the spleen. It is connected with the duodenum, the mesentery, and the spleen. It is eight or nine inches long, two finger-breadths broad, and about one finger-breadth thick. Its weight is about three ounces, though it greatly varies. It is broadest near the duodenum and becomes gradually narrower towards the spleen. Surrounding it is a membrane which is continuous with the peritoneum. Where it is attached to the colon, this membrane is called the mesocolon. Its substance is glandular, formed by a conglomeration of many lesser parts, and contains glands of both external and internal secretion. Its arteries arise from the coeliac, splenic, and superior mesenteric arteries, and its veins from the splenic vein; its nerves are from the vagus and intercostal.
To understand life is not given to man. This is above his comprehension (II E.A.K. no. 266). Not only is this true of Life itself (ibid. no. 252), but also of Life which inflows (ibid.). Only the forms which receive life can be comprehended. Light we do not know; only the form the energy takes—transverse waves of known length, frequency, and speed.