“…It is well known that the major contractions of the reticulo-rumen are controlled via the vagus nerves from gastric centres in the medulla oblongata (Mangold & Klein, 1927;Hoflund, 1940;Duncan, 1953;Bell & Lawn, 1955;Iggo, 1956;Andersson, P. C. GREGOR Y Kitchell & Persson, 1959;Beghelli, Borgatti & Parmeggiani, 1963;Howard, 1968; Harding & Leek, 1971), and that removal ofthis vagal control results in reticulo-rumen paralysis. This response contrasts markedly with that of the monogastric stomach of man (Grimson, Baylin, Taylor, Hesser & Rundles, 1947; Beattie, 1949) or dog (McCrea, McSwiney & Stopford, 1926) and with that of the abomasum, the ruminant counterpart ofthe monogastric stomach (Duncan, 1953), which all retain considerable activity after vagotomy although often with considerably modified emptying rates.…”