ON THE MOTIONS AND SOUNDS OF THE HEART. 181 
8. 6. On touching the arteries close to the heart a feeling, 
as of efflux and reflux, was very distinct, especially in the 
aorta, the former coinciding with the systole of the ventricles, 
the latter with the diastole. At the same moment with the out- 
ward current in the arteries, or during the ventricular systole, 
a peculiar jerking upwards of the periphery of the auri-ven- 
tricular orifices,—and a similar eccentric movement was ob- 
served over the arterial openings during the reflux current or 
undulation in the vessels, ¢.e. during ventricular diastole. 
S.7. The sinuses of the auricles were found by the touch 
to contract vigorously, before the ventricles considerably, and 
even before the shrinking, &c., or systole of the appendices. 
S. 8. Small three-triangular pieces of white card were made 
to adhere to the fundus and apex cordis respectively, and ob- 
servation was made through a roll of paper sufficiently large 
to take in, at a convenient distance, both extremities of the 
organ, and held so that each white object rested on a distinct 
limb of the tube’s mouth, and every change of distance be- 
tween the points dotted white was readily detectible,—and the 
uniform result was, that the apex approached the base in 
systole and receded again in diastole, and the range of oscil- 
lation seemed about rd of an inch. 
S. 9. While the heart still acted, but with much diminished 
force, a cut was made in the right auricle and a copious flow 
of blood obtained, having slight jets in the auricular systole, 
and immediately before the ventricular hardening, elevation, 
&c., but being continuous during diastole. 
Note.—The ventricles appeared not to differ in size on care- 
ful examination—post mortem cordis. 
OsservaTion IY. 
dune 27.—Subject, a stout Ass three to four weeks old. 
Heart acted very vigorously until weakened by hemorrhage, 
and continued to beat with considerable energy for two hours, 
when it was extracted, still contracting. Phenomena: Effects 
of various forms of pressure on the heart ;—rhythm of cardiac 
and arterial pulses ;—ventricular systole ;—auricular ditto ;— 
sound of auricular systole ;—pulsation of cava ;—auricular 
diastole ;—spontaneous or incidental variations in cardiac 
sounds ;—protrusion of septum into right ventricle in systole. 
S$. 1. A stethoscope loaded with 2 Ibs. weight of shot in a 
bag, was placed on the heart before opening the pericardium 
{as in experiment 3 of last observation), and was raised at 
each systole with a sudden heave or jerk, and with much 
