In the Section on Ophthalmology at the 1908 session of the American Medical Association I presented a rough wire model of the instrument which now appears in a perfected form (see illustration). I have named it the "muscle indicator" and claim for it that it will show every phase of any ocular muscle or combination of ocular muscles, normal or abnormal. It answers, I believe, every question that can be asked concerning the ocular muscles, and, moreover, concerning the brain centers that control the ocular muscles; in fact, it is, as it were, a talking machine, but it has to talk through me.
The device is of use not only in teaching, for it makes teaching of the ocular rotations perfectly easy, but also in the management of intelligent people suffering from muscle errors. There is no difficulty in showing the patient what the condition is and