What is the blood?
Red globules floating in serum, or a sort of whey.

The serum in poor Fougas was dried up in his veins; the water which we have gradually introduced by a slow endosmose has saturated the albumen and fibrin of the serum, which is returned to the liquid state.
The red globules which desiccation had agglutinated, had become motionless like ships stranded in shoal water.

Now behold them afloat again: they thicken, swell, round out their edges, detach themselves from each other and prepare to circulate in their proper channels at the first impulse which shall be given them by the contractions of the heart." "It remains to see," said M.Renault, "whether the heart will put itself in motion.

In a living man, the heart moves under the impulse of the brain, transmitted by the nerves.

The brain acts under the impulse of the heart, transmitted by the arteries.