Abstract
When a rabbit, which is in a condition of eye-nystagmus its one Labyrinth being broken, is put under Chloroform and is kept in medium stupor, the quick components disappear and the eye-ball deviates to the direction of a slow contractor and stops.
The author cuts off four muscles from the eye-ball but leaves M. rect. int, and ext. and put a poise on a string other end of which is joined with an end of the muscle that caused the leviation of the eye-ball.
Thus the weight, which was used to pull back the eye-ball on its right position, is the tones of deviation. Then as the rabbit awoke and nystagmus reappeared the author measured M. rect. int. and M. rect. ext. of their limiting loads, i. e. the maximal weight which these nuscles are able to lift up under the contraction of eye-nystagnus. And by comparing these numerical values with the statical tones of eye-muscles on their right position, it can be stated as follows:—
1) The tones of deviation of eye in case of its one labyrinth being broken is bigger than the statical tones of its muscle and smaller than the limiting load, i. e.:—
Statical Tonus…P.
Tonus of deviation…P.+X.
Limiting load…P.+X.+Y.
2)The deviation of eye in case of its nystagmus does not caused through slow components as it was hitherto called. It is the preceeding phenomenon to the rhythmical movement of eye-hall. And moreover it appears consistently during the activity of eye-nystagmus. So the author thinks that it is appropriate to look at it as an independent phenomenon of vestibular eye reflex.
