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In the numerous observations made in my laboratory upon this object, we have only once seen a combination of vessels in which there might be a direct communication between a small artery and a vein, though the two observers could not come to a final conclusion on the point.

If we now plainly perceive that the passage of the blood from the arteries into the veins of the tadpole is not performed in any other than those vessels, which are so minute as only to admit the passage of a single globule at a time, we may conclude that the same is performed in like manner in our own bodies and in those of other animals.

I found it possible to observe at least the superficial capillaries of muscles both in the frog and in mammals through a binocular microscope, using strong reflected light as a source of illumination. Resting muscles observed in this way are usually quite pale, and the microscope reveals only a few capillaries at fairly regular intervals.

When blood is placed under a microscope, it appears as a number of minute globules or discs, but when seen by the trained clairvoyant as it courses through the living body, blood is found to be a gas, a spiritual essence.

I have seen the movement of the sinews of the sky, And the blood coursing in the veins of the moon.

I've always believed human blood is red because it really needs to draw attention to itself.

Thanks to our present surgical methods in physiology we can demonstrate at any time almost all phenomena of digestion without the loss of even a single drop of blood, without a single scream from the animal undergoing the experiment.

The body is meant to be seen, not all covered up.

The circulatory system of man and the vertebrate animals can be considered as made up of a small number of organs or subordinate systems, which are easy to recognize anatomically, and the functions of which are on the whole quite distinct.

I have wondered sometimes if there are not perhaps some disadvantages in having really blue blood in one's veins, like grandmamma and me.