I confess that I have been led to embrace this opinion by a careful consideration of the structure and use of the valves in the veins.
Blood circulation
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"The world is full of wonders, but man is the greatest wonder of all."
Strange & Unusual"The heart is the beginning of life, and the source of all motion."
Strange & Unusual"The human body is a machine, but it is also a living soul."
Strange & Unusual"The blood in the arteries is of a more florid colour than that in the veins."
Strange & Unusual"The heart is a pump, and the blood is a fluid."
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