"As for the heart, the substance of it is compact and firm, and full of fibres of all sorts. The upper part is called _Basis_ or _Caput_: the lower part _Conus_, _Mucro_ or _Apex Cordis_. When the heart contracteth itself it is longer, and so the point is drawn from the head of it. But when it dilateth itself it becometh rounder, the conus being drawn to the basis. About the basis the fat is. It is covered with a skin which hardly can be separat[ed]. In moist and cowardly creatures, it is biggest.... Of all parts of the body it is hottest, for it is the wellspring of life, and by arteries communicateth it to the rest of the body. The heart hath two motions, Diastole and Systole. In Diastole, or dilatation of the heart, the conus is drawn from the basis to draw blood by the cava to the right ventricle, and air by the arteria venosa [pulmonary vein] to the left ventricle. In Systole or contraction the conus is drawn to the basis. "First, that the vital spirit may be thrust from the left ventricle of the heart into the aorta. "Secondly, that the arterial blood may be thrust into the lungs by arteria venalis [the left auricle]. "Thirdly, that the blood may be pressed to the lungs, in the right ventricle by vena arterialis [right auricle]. "The septum so called because it separateth the right ventricle from the left, is that thick and fleshy substance set between the two cavities. "Riolan will have it the matter of the vital blood to pass through the holes or porosities of it from the right to the left ventricle, but that hardly any instrument can show them. First, because they go not straight, but wreathed. Secondly, because they are exceeding narrow in the end. He affirmeth that they are more easily discerned in an ox-heart boiled." It is difficult to realise how any reasonable man could teach such a farrago of nonsense when he must have heard Harvey's perfectly simple and clear demonstration of the structure and uses of the heart. Harvey was lecturing on Tuesdays, Wednesdays, and Thursdays; Reid only lectured on Tuesdays, and Harvey had especially set himself to controvert the very errors that Reid was promulgating. But Reid was perfectly impenitent, for his Manual was reprinted in 1637, in 1638; and after his death it appeared again in 1642, 1650, 1653, and 1658, yet there is no alteration in his text. He was not even sure of the broad features of the anatomy of the heart, for he writes: "The first vessel in the chest is the vena cava or magna. The second vessel in the breast is vena arterialis. It is a vein from its office, for it carrieth natural blood to the lungs by the right side of the windpipe. It is called an artery because the coat of it is double, not single. It doth spring from the upper part of the right ventricle of the heart, and is implanted into the substance of the lungs by the right side of the windpipe."