THIS experimental study was embarked on to determine the feasibility and limitations of transplanting the vitreous. The vitreous has proved to be one of the most difficult parts of the eye to deal with, and has been approached by a small number of workers in different ways, with scant success. The experimental studies on this structure have been remarkably few considering its importance and volume, probably because most ophthalmologists have a great fear of the vitreous and want to stay away from it. It does not take an ophthalmic surgeon long to learn that it is desirable never to see the vitreous, as its loss, injury or infection is poorly tolerated. The diseases of and degenerative changes in the vitreous are subtle and are not well understood; worst of all, they do not respond to the treatment heretofore available. Withdrawal of the vitreous as a therapeutic measure was performed by