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THREE-DIMENSIONAL MOTION PICTURES 29 he still looks at the same object with the face turned a little to one side, the pupil no longer appears in the center of the eye, more "white'*' being seen on one side than on the other. A moment's thought is not necessary to see how inconvenient it would be for one to lack the means of turning the eyes. The mobility qf the eyes is abso lutely necessary for the purpose of distance vision. The eyeball is worked by many muscles. It has a muscle to turn it heavenward, one to turn it earthward, another to turn it to the left and one to turn it to the right, besides two more of somewhat complicated action, six outside muscles in all for each eye. By outside we mean exterior to the eyeball. The top muscle is called the superior rectus, the bottom, the inferior rectus, the muscle on the nasal side of the eyeball is the internal rectus, and the remaining muscle the external rectus. When one looks upward the superior recti muscles are used, in glancing downward, the inferior recti muscles are used. The axis of a body is a line with respect to which its parts are symmetrical, so that the axis of the eye is an imaginary line passing through the centers of the cornea, lens and eyeball. This line is generally called the optic axis. We have stated that there are six outside muscles to each eye: four we have described; the remaining two are called oblique muscles, and they are employed to turn the eye on its axis, to make it rotate. This takes place unconsciously to ourselves whenever we incline the head to one side or the other. We are now roughly acquainted with the external mechanism of the eye. How is it that we can see an object a mile away as well, so far as its general form is concerned, as we