CHAP. IX. Of Giddiness, called Vertigo.
Avertigo is a false Imagination, in which all objects, and the head it self seem to turn round, so as the Patient often falls to the ground, unless he lay hold on some stay at hand.
It may be objected, That in a Vertigo, the Imagination is not hurt; for if it were so, the Patients would think the objects truly turned round; as men in Madness and Phrenzy do think what they imagine to be truly so. We answer, That in a Vertigo, the Reason is not hurt, which perceiveth the error of the Imagination; but in a Phrenzy, or Melancholly, the Reason is hurt as wel as the Imagination.
There are two sorts of Vertigoes; the one simple, called in Greek 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, in which the Sight re∣mains unhurt: the other is called 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, or 〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉, a dark Vertigo, in which the Eyes are both darkned as it were with smoak, or a cloud.
In both kinds the Sight is somwhat hurt, because the Spirits which use to go directly to the Eyes, are moved out of order by the visive Nerve, by reason whereof the Eye doth not so sitly enjoy them. But in a dark Vertigo there is a more violent Motion of the Spirits, so that they come less to the Eyes, from whence the sight is darkned or hindred.
The immediate Cause of a Vertigo, is the circumvolution of the Spirits coming of a vaporous matter or wind, which coming into the Ventricles of the Brain, and Plexus Choroides, disturbs the Spirits, and makes them run round; whence the species of the Objects brought by those spirits are moved in like manner; and so the objects themselves seem to be moved also the same way. But here we may doubt, since a Vertigo is a symptom of a hurt action, and every action hurt depends immediat∣ly upon a Disease, how the Circumvolution of the Spirits can be the immediate cause of a Vertigo, when it can be referred to no kind of Disease. To which we thus answer, A Circumvolution of the Spirits, is a Disease in respect of Scituation; for at that time the Spirits do not keep that place or po∣sition which they Naturally ought, but move preternaturally, and amiss. And this Answer hath a weighty instance: For a Disease is an affection of a true part, but spirits are not true parts. We answer, That Axiome is not alwaies, but sometimes true; according to Galen that which is principal and hinders the action of its self, is the true Disease: We say that the word Part ought to be taken in a larger sense, comprehending all those things which go to the making up of the Body, and whatso∣ever hinders the action of any part, is called a Disease. So a yellow color in the Eye, hurts the sight immediately, and therefore it is called a Disease in number; so a better savor in the tongue, and noise in the Ears, are Diseases in number, in regard there is something in those parts besides, which offendeth the actions. After the same manner is the Circumvolution of the Spirits, a Disease in Scituation or Position, for the Reason above mentioned.
But those Vapors are sent up from evil humors, not continually without intermission, but by com∣pass and going about, and at a distance, namely, as often as they are raised up by an external cause; and the humors are such as use to produce vapors, namely, Blood, Choller, Flegm, and Melancholly, and the watery Humor; because both a cold as well as a hot vapor, may cause a Vertigo; as Galen, 3. de loc. affect. chap. 8. and Comment. Aphor. 23. Sect. 3.
These evil humors are either contained in the Brain, or in the inferior parts. Hence a two-fold Vertigo ariseth, one Proper, the other by Consent.
Waterish and flegmy humors heaped up in the Brain, send wind and vapors to its ventricles, which stirring about there, do cause a Vertigo. And so a proper Vertigo comes to be a forerunner of an Epi∣lepsy, or Apoplexy.
But Humors contained in the inferior parts, especially the stomach and the spleen, do easily send up Vapors to the head, which if they touch the Ventricles, and the Arteries, cause a Vertigo.
The external Causes are all such things as will quickly dissolve the Humors, and turn them to Va∣pors, or make an inordinate motion in those Vapors. Among which are reckoned by Hippocrates, Aphor. 17. Sect. 3. a South wind, and sudden change of Air. To these ad the heat of the Sun, windy Meats, Garlick, Mustard, Radish, Pease and Beans, Drunkenness, Gluttony, immoderare Exercise, and unseasonable, the suppression of a wonted evacuation, Anger, Baths, Hunger, especially in those which are ful of bitter Choller, often turning of the Body round, long looking upon Wheels and