Dereri, (from juice, and to distil); called also theriacalis bezoardica aqua. It is a fluid dis-tilled from the theriaca Andromachi,or from Mithridate. Chylus, (from juice, ) called, in

Paracelsus, chymosum. In general it is a juice inspissated to a middle consistence between fluid and dry.

In Hippocrates the word is used to express the juice and sorbile liquor of barley, called strained ptisan, being the expressed substance of the barley; not what the Latins called cremor, which is only the barley water. To is opposed ptisan unstrained.

By chyle, however, is commonly meant the oily part of our aliment, mixed with the saliva and other juices poured into the stomach and duodenum. It assumes the form of chyle only in the duodenum, since it never appears in the lymphatics of the stomach. It is apparently an uniform fluid, whatever be the food employed, or the animal in whose stomach it is digested. it has been supposed, though without sufficient foundation, to resemble milk; but milk in the stomach is not absorbed till it has undergone the digestive process, and milk injected into the blood vessels produces the most formidable symptoms. The real nature of chyle is not known. It seems to consist of a serous and a coagu-lable part, with distinct globules, which give it opacity, and have been supposed, rather than proved, to be oily. The small quantity of chyle that can be obtained, is the reason why its nature has not been more carefully examined.

The chyle, when it enters the blood, does not immediately mix with it, but in many instances seems to pass in a separate state through the whole circulation: for the chyle has been seen to float on the surface of blood, when taken from the arm: in the last stage of a diabetes, the urine manifestly points out the presence of chyle in it See Haller's Physiology on the chyliferous vessels.