The valves in the veins are so constructed as to permit the passage of blood towards the heart, but to prevent its return.
Blood circulation
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"Without the circulation of the blood, there can be no true life."
Philosophical"Nature is nowhere accustomed to exhibit herself more openly than in her failures."
Strange & Unusual"The blood is the life."
Strange & Unusual"The heart is the beginning of life; the sun of the microcosm, even as the sun in his turn might well be designated the heart of the world; for it is the heart by whose virtue and pulse the blood is mo…"
Philosophical"The greatest pleasure is to discover something new."
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