lated; H2SO, reflex.

EXPERIMENT 15. Frog; cerebrum ab- | the atlas and occiput then injections per

Time, A. M.

jugular showed an elevation of blood-press

Met. ure. This rise of arterial tension is due to

Fig. 3.-Injection, per jugular, of grain of pituitary body in the shape of a filtered infusion; the spinal cord was cut between the occiput and atlas; the cardiac nerves in the neck

were cut.

CIRCULATION.

Large doses depressed the rapidity of the pulse. The pulse-rate was occasionally increased. The pressure was at first depressed and then increased (Fig. 4).

Section of the vagi or the use of atropine did not prevent this slowing of the pulse. As to the rise of arterial tension it ensued after section of the cord between the atlas and occiput. The spleen evidently elevates the blood-pressure by an action on the arteries.

Occasionally, as in Fig. 4, the gland slowed the heart to a considerable extent.