Artificial Membrana Tympani.
[To the Editor of the Modical Times and Gazette.]
Sir,—Allow me, through the medium of your Journal, to suggest to
those medical men who are using the artificial membrana tympani, that
when it is not in use it should be kept in water. By this means it re-
tains its form, and it is kept quite soft. As at present manufactured
by Weiss, the artificial membrana tympani is made of vulcanized India-
rubber, not much thicker than ordinary writing paper; I find this mate-
rial preferable to gutta percha, which is apt to wrinkle.
I am, &c.,	Joseph Toynbee.