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The originals of the woodcuts are, for the most part, to be found in the works of Bourgery, Gray, Henle, and Kölliker.

A few are new. I am particularly indebted to my accomplished friend, Dr. Michael Foster, for the pains and trouble he has bestowed upon the Lessons in their passage through the press.

THE ROYAL School of MINES, LONDON,

October 1866.

Tue VASCULAR SYSTEM AND THE CIRCULATION.

Pp. 21–57.

the heart, through its contractions, drives the blood

always in one direction, explained.

13. The working of the arteries.

14. The beat of the heart.

15. The sounds of the heart.

16. The pulse in the arteries.

17. Why blood flows in jerks from a cut artery.

18—20. Why no pulse can be felt in the capillaries.

21,22. The circulation traced in its whole course.

23. The nrvous system regulat:s the calibre of the small

arteries and veins, and thereby controls the flow of blood

through various parts: blushing, &c.

THE SOURCES of LosS AND OF GAIN TO THE BLOOD.

Pp. 101--132.

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