[The two portraits shown in Plate II are those of an interesting case of chorea which had continued during the lifetime of the patient, a boy of sixteen. The boy was feeble-minded and incapable of learning. His whole body was in perpetual motion. This is well shown in the photograph, taken April 28th, when, notwithstanding the rapidity of modern photography, it was quite too slow to get a clear picture. The shaded borders of the picture show the movements of the head. The boy had hyperopia 2•50 D., and insufficiency of the interni, to the extent of producing, much of the time, homonymous diplopia, which was shown when a red glass was placed before his eyes, the refractive error being first corrected. Tenotomy of the left internus was done, April 28, 1885, and of the right on the 6th of May following.
The change in the boy's condition was marvelous. The two portraits do not exaggerate the improvement, nor do they even adequately represent it. He has had no chorea during the two years which have past. He has attended school, where he has made some progress in his studies, and is in every respect mentally and physically greatly improved.*]
*This case, not in the original essay, is introduced here on account of the accompanying portraits of Plate II.
