int of red rough gooseberries, and a pint of white smooth ones, brought
them up in small parcels into his mouth, and restored them separately to
the spectators, who called for red or white as they pleased, till the whole
were redelivered.

7. At the same time that these motions of the stomach and throat are
stimulated into inversion, some of the other irritative motions, that had
acquired more immediate connexions with the stomach, as those of the
gastric glands, are excited into stronger action by this association; and
some other of these motions, which are more easily excited, as those of the
gastric lymphatics, are inverted by their association with the retrograde
motions of the stomach, and regurgitate their contents, and thus a greater
quantity of mucus, and of lymph, or chyle, is poured into the stomach, and
thrown up along with its contents.

8. These inversions of the motion of the stomach in vomiting are performed
by intervals, for the same reason that many other motions are reciprocally
exerted and relaxed; for during the time of exertion the stimulus, or
sensation, which caused this exertion, is not perceived; but begins to be
perceived again, as soon as the exertion ceases, and is some time in again
producing its effect. As explained in Sect. XXXIV. on Volition, where it is
shewn, that the contractions of the fibres, and the sensation of pain,
which occasioned that exertion, cannot exist at the same time. The exertion
ceases from another cause also, which is the exhaustion of the sensorial
power of the part, and these two causes frequently operate together.

9. At the times of these inverted efforts of the stomach not only the
lymphatics, which open their mouths into the stomach, but those of the skin
also, are for a time inverted; for sweats are sometimes pushed out during
the efforts of vomiting without an increase of heat.

10. But if by a greater stimulus the motions of the stomach are inverted
still more violently or more permanently, the duodenum has its peristaltic
motions inverted at the same time by their association with those of the
stomach; and the bile and pancreatic juice, which it contains, are by the
inverted motions brought up into the stomach, and discharged along with its
contents; while a greater quantity of bile and pancreatic juice is poured
into this intestine; as the glands, that secrete them, are by their
association with the motions of the intestine excited into stronger action
th