These Head-Achs we treated entirely as Agues of the same Type. When
the Patient was strong, some Blood was taken away, and afterwards we
prescribed an Emetic and Purge, and then gave the Bark liberally,
which generally put an End to the Complaint, without any bad
Consequences attending.

OF THE JAUNDICE.

The Jaundice, or a yellow Colour of the Eyes and Skin, occasioned by
an Absorption of Bile into the Blood, was another Distemper which
appeared towards the End of each Campaign.

This Disorder, for the most part, takes its Rise[89] from Calculi
lodged in the biliary Ducts[90]; and sometimes from a viscid Mucus or
Pituita obstructing those Passages[91]; and it may be brought on by a
Tumour, or any other Cause[92], compressing these Ducts, so as to
prevent the free Flow of the Bile into the Cavity of the Intestines.

[89] Obstructions and Scirrhi of the Liver have been assigned
as the Cause of the Jaundice; but as we have so many Cases of
this Kind related where no Jaundice appeared, it is now much
doubted, whether such Obstructions, which do not affect the
Ducts, are capable of producing this Disorder.

[90] We have numerous Cases in _Bonetus_, and other physical
Observations, where Calculi have been found in the Gall
Bladder, and Ducts of People who have died of the Jaundice;
and I have frequently found two, three, and sometimes twelve,
fifteen, or twenty, such bilious Calculi in these Cavities.

[91] Viscid Mucus or Pituita, or viscid Bile, has been
observed frequently to obstruct the Ducts. Dr. _Coe_ says,
sometimes icteric Patients discharge very thick Bile, almost
as viscid as Bird-Lime. See his _Treatise on biliary
Concretions_, chap. ii. where he has collected a great Number
of icteric Cases, in which the Bile has been found quite
viscid after Death.

[92] See the Case of a Jaundice in _Bonetus's Sepulchretum
Anatomicum_, tom. II. p. 326, where the Sides of the common
biliary Duct were compressed by an Enlargement of the Glands
about the _vena portarum_; and we sometimes meet with a
Jaundice in pregnant Women which goes off after Delivery, and
seems to have been caused by the Pressure of the Uterus and
indurated Foeces in the Colon. _Van Swieten_ says, he has seen
this very frequently, vol. III. sect. 918, p. 95.

The yellow Colour, or Jaundice, observed in the Ague, and some other
bilious Di