It will be convenient all along to have pen, ink, and paper, ready at hand, to write down in a word what you signify to him by signs, and cause him to write, or show how to write what he signifies by signs, which way of signifying their mind by signs deaf persons are often very good at; and we must endeavour to learn their language, if I may so call it, in order to teach them ours, by showing what words answer to their signs. It will be convenient, also, as you go along, after some convenient progress made, to express, in as plain language as may be, the import of some of the tables; as for instance:-- The head is the highest part of the body, the feet the lowest part; the face is the fore part of the head, the forehead is over the eyes, the cheeks are under the eyes, the nose is between the cheeks, the mouth is under the nose and above the chin, &c. And such plain discourse put into writing, and particularly explained, will teach him by degrees to understand plain sentences; and like advantages a sagacious teacher may take, as occasion offers itself from time to time. This extract is mostly taken out of the ingenious Dr. Wallis, and lying hid in that little book, which is but rarely inquired after and too scarcely known, died in a manner with that great man. And as he designed it for the general use of mankind that laboured under the misfortune of losing those two valuable talents of hearing and speaking, I thought it might not be amiss (in the life of so particular a dumb person as I am writing) to give them this small but particular fragment of grammar and syntax. It is exactly adjusted to the English tongue; because such are the persons with whom the Doctor had to deal, and such the persons whose benefit alone I consult in this treatise. One of the chief persons who was taught by Dr. Wallis was Mr. Alexander Popham, brother-in-law (if I am not mistaken) to the present Earl of Oxford; and he was a very great proficient in this way; and though he was born deaf and dumb, understood the language so well as to give under his hand, many rare indications of a masterly genius. The uncle of his present Sardinian Majesty, as I have been credibly informed, had the want of the same organs, and yet was a perfect statesman, and wrote in five or six different languages elegantly well. Bishop Burnet, in his book of travels, tells us a wonderful story, almost incredible; but tells it as a passage that deserves our belief. It is concerning a young lady at Genoa, who was not only deaf and dumb, but blind, too, it seems, into the bargain; and this lady, he assures us as a truth, could, by putting her hand on her sister's mouth, know everything she said.