Hullin or Chullin (lit. "Ordinary" or "Mundane") is the third tractate of the Mishnah in the Order of Kodashim and deals with the laws of ritual slaughter of animals and birds for meat in ordinary or non-consecrated use (as opposed to sacred use), and with the Jewish dietary laws in general, such as the laws governing the prohibition of mixing of meat (fleishig) and dairy (milchig) products. While it is included in the Seder Kodashim, it mainly discusses non-consecrated things and things used as the ordinary human food, particularly meats; it is therefore sometimes called "Shehitat Hullin" ("Slaughtering of Non-Consecrated Animals"). It comprises twelve chapters, dealing with the laws for the slaughtering of animals and birds for meat for ordinary as opposed to sacred use, with other rules relating to the eating of meat, and with the dietary laws in general. The rules prescribed for kosher slaughtering, known as Shechita, include five things which must be avoided: there must be no delay; no pressure may be exerted on the knife's moving backwards and forwards; the knife must not be allowed to slip beyond a certain area of throat; there must be no thrusting of the knife under the skin or between the gullet and windpipe; the gullet or windpipe must not be torn out of position in the course of slaughtering. Mishnah The contents of the Mishnah's twelve chapters may be summarized as follows: When, and by whom, an animal must be killed to be ritually fit for food; the instrument with which the killing must be done; the space within which the incision must be made, and the exceeding of which renders the animal "terefah." Incidentally, it discusses the differences between shechitah and melikah (pinching off the heads of birds brought as sacrifices; see , ), and the various degrees in which different vessels are susceptible to impurity. The organs that must be severed: in quadrupeds, the trachea and the gullet, or the greater part of each, must be cut through; in fowls, cutting through one of these organs, or the greater part of one, suffices. In both cases the jugular vein must be severed. Rules as to the character of the incision follow. Then comes a series of rules regarding animals killed in honor of foreign deities or of deified natural objects: regarding the localities where the formal killing of an animal might create a suspicion of idolatry;