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The illustrations are reproductions of blackboard drawings. A few of them have already appeared in my Physiologist’s Notebook and Primer of Physiology; but the large majority are now printed for the first time.

ALEX HILL.

November, 1908.

NOTE ON THE FRONTISPIECE

Four photomicrographs of cells or parts of cells of brain-tissue, coloured by the chrome-silver method (cf. p. 293).

A.

B.

C.

D.

All four sections were cut vertically to the surface.

Fig. 2.—Diagram showing the Relative Positions of the Organs

of the Chest and Abdomen.

The ribs from the first to the tenth have been cut across in the lateral line. The eleventh and twelfth ribs do not reach sufficiently far forwards to be cut. With the exception of a short segment near its junction with the ascending colon, the small intestine has been removed. The trachea is seen to divide into bronchi beneath the arch of the aorta. The right lung has three, the left two lobes. The kidneys are situate behind all the other viscera. On their upper ends rest the two suprarenal capsules. The lower edge of the right lobe of the liver follows closely the line of the ribs and costal cartilages. Below the left lobe of the liver the stomach comes to the anterior abdominal wall. The transverse colon (large intestine) comes to the anterior wall below the stomach. Below the latter the wall is in contact chiefly with coils of small intestine. The vermiform appendix rests on the posterior wall. Spleen and pancreas are not shown in the diagram.