...In the interval between the contractions these valves hangdown into the ventricles... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The heart is situated in the middle line of the chest, its apex pointing to the sternum, and is inclosed in a strong pericardium: it is made up of two aurieles and two ventricles...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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