Vitality of the Heart.  — its vitality is as amazing as its strength.  While life exists this tireless order never stops.  In disease, as long as a flutter of this wondrous organ exists, we know the spark of life is not altogether vanished, and new Hope is begotten that helped me be restored.  Airing such long lives as we sometimes see, the heart has propelled no less than 500,000 tons of blood; and yet, during all this patient, unfaltering and unflinching labor, it is her.  Self as the waste has occurred.

Heart Rhythms.  –the rhythm of its beats never fails until death breaks into the casket and seizes the ever thriving pendulum at the command of the great Master Workman,  silencing the quivering muscles of the heart and compelling the wheels of like a standstill.

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This closes out the introduction to the workings of the heart, and the author ends the section talking about heartbeats or heart rhythms, but in doing so doesn’t talk about heart rhythms or heartbeats at all.  Notice the capitalize reference to Master Workman.  I’m sure would’ve been some sort of sacrilege not to capitalize those two words and so they are capitalized.  But it’s still a little bizarre.  Next section were heading into the digestive system, which is probably just as mysterious to the author as the working of the heart!