" (yellow) where B stands.]
[Footnote: 15—23. These lines stand between the diagrams I and III.]
[Footnote: 24—53. These lines stand between the diagrams I and II.]
[Footnote: 54—97 are written along the left side of diagram I.]
82.
An experiment showing that though the pupil may not be moved from its position the objects seen by it may appear to move from their places.
If you look at an object at some distance from you and which is below the eye, and fix both your eyes upon it and with one hand firmly hold the upper lid open while with the other you push up the under lid—still keeping your eyes fixed on the object gazed at—you will see that object double; one [image] remaining steady, and the other moving in a contrary direction to the pressure of your finger on the lower