When the child came to me I had not had sufficient experience of the effects of the prussic acid vapour, and I hesitated in using a remedy of such acknowledged potency until I had, with great care, thoroughly investigated its properties. This I have been engaged in doing for several years, and I am now able to state, that in no case in which I have used it has it been attended with any injurious effects either to the eye or general health. CASE 7. _Staphyloma of both Eyes._ MARY ANN GOODMAN, aged 22, of St. Giles's Workhouse, and a scholar at the Blind School, Queen Square, fourteen years ago was attacked with violent inflammation of both eyes. To remove this she was subjected to very active antiphlogistic treatment. The inflammatory symptoms subsided, after which she was regularly led for five years to an Ophthalmic Institution, at which place the right eye was operated upon five times; in addition to which she was cupped three times and bled from the arm twice; caustic was applied frequently to the inside of the eye-lids; she was also blistered behind the ear and nape of the neck. The patient was unable to walk about without assistance; if she attempted to do so, she was knocked and jostled about. On the 4th of March her friends brought her to me, to ascertain whether I could do anything for her. I could not hold out to her any great hope of recovery; for both eyes were affected with staphyloma, and perfectly opaque and studded with blue spots, and standing prominently out beyond the lids, and having no appearance of iris or pupil in either eye. In the space of a fortnight the eye assumed a very different appearance; each eye became greatly diminished in size. As the opacity cleared off, a large triangular pupil made its appearance at the bottom of the iris in the right eye, enabling her to see with the eye with which, for fourteen years, she had not been able to discern light from darkness. The progress of cure in the left eye is fully equal to that of the right; so that now she is able to walk about in the crowded streets with safety, and is intrusted to lead about two or three other persons in the Blind School. She can distinguish colours, and is able to perceive large letters. In such a state of disorganization as this poor girl's eyes were in, it is unreasonable to anticipate that she can make much greater progress. CASE 8. _Inverted Eye-lashes, with Opacity of the Cornea._ DIANA PRIMROSE, aged 32, of No. 2, Benborough Street, St. Giles's, says she had a violent attack, eight years back, of ophthalmia in both eyes, accompanied with great swelling and constant discharge of matter from the eye-lids, arising from the eye-lashes of both eyes being turned in.