Volume 4

Academical lectures on the theory of physic. Being a genuine translation of his Institutes and explanatory comment. Collated and adjusted to each other, as they were dictated to his students at the University of Leyden ... / [Herman Boerhaave].

  • Boerhaave, Herman, 1668-1738
Date:
1742-1746
Catalogue details

Licence: Public Domain Mark

Credit: Academical lectures on the theory of physic. Being a genuine translation of his Institutes and explanatory comment. Collated and adjusted to each other, as they were dictated to his students at the University of Leyden ... / [Herman Boerhaave]. Source: Wellcome Collection.

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    draws the Eye towards the pofierior and lower Part of the Orbit outwards, and turns the Pupil upwards and towards the Nofe ; that is to fay, it turns the Eye round upon its own Axis, and at the fame time draws it out of the Orbit towards the Nofe, fo as to render it capable of feeing the Eye¬ brow above the Nofe. And this is the proper Ufe of this Mufcle when it ads alone. 7 When both thefe Mufcles ad together, the one of them draws the Eye out of the Orbit down¬ ward, and the other upward *, by which means thefe Mufcles deflroy the Action of each other, as far as they are Rotators of the Eye, by their ad- ing in a contrary Direction ; at which time they exert all their Force in drawing the Eye outwards, fo as to render it protuberant: by this means therefore they render the Face fierce, terrible and cruel, which Painters well know, as they exprefs thefe PafTions of the Mind by fuch a turgid Por¬ tion of the Eyes *, and which we ourfelves conftant- ly perceive in People who are in a Rage with An¬ ger, and eager after Revenge. 2. Alfo when thefe Mufcles ad: together, they draw the whole Eye towards the Nofe, that it may be better able to diflinguifh Objeds. This Action is alfo obfer- vable in thole who are fighting or thriving for their Lives, as in Duelling, when each is very intent upon the Motions of his Antagonifl. But when the redi Mufcles of the Eye ad together, we do not.fee near Objeds. 3. De la Hire well obferves, that the Eye of a Perfon or other Animal in a great Fright is fixed protuberant out of the Orbit, fo that the Eye may be eafily determined towards any Part which is intended to be obferved by the Adion of any of the redi Mufcles. The ancient Statua¬ ries very well expreiTed this Adion in their Figures of Lycaon. This Adion of the oblique Mufcles is fo