The Letter [_r_] is the most difficult of all the rest, yet amongst six Deaf Persons, which I have hitherto instructed, four of them pronounce it with the greatest easiness; the other two cannot form it, but in their Jaws; but I teach them, by moving the Hand one while to the _Throat_, and another while to the _Mouth_, whereby they may, as it were, feel the subsulting and interrupted Expulsion of the _Voice_; also I bid them to look often in the Glass, to observe the tremulous and fluctuating Motion of the _Tongue_; but no one can expect at the first trial, the genuin Pronounciation of this Letter. When the _Vowels_ and _Semi-vowels_ are well inculcated into them, _the Consonants_ are learnt without any trouble almost, for they are a _Simple and Mute Breath_, coming forth, either successively, or suddenly, according to the various _Openings of the Mouth_, and only with putting the Hand to the Mouth almost, they may all easily be learned. [_h_] is the most simple of all, nor is it any thing else but Air, which is breathed out thicker, and more swiftly. [_g_] or _ch._ is sharper than [_h_] which I teach thus, when I shew to my Deaf Patients the posture of the _Tongue_ in a Looking-Glass, and give them to feel the expiring _Breath_; it is so in like manner with [_s_] and [_f_] insomuch, as nothing is more easie than they, and which may most easily be learned by the fore-going Description. I can teach a Deaf Man, (though he were blind) the _Explosive Consonants_; for if I cause him to feel the _Breath_ discharged upon him, he would necessarily pronounce one of the three; for I bid him to look simply on my _Mouth_ and _Tongue_, and then having put his Hand to my _Mouth_, I pronounce either [_k._] or [_b._] [_p._] or [_d._] [_t._] and command him to do the like. (_x._) and (_z._) are pronounced no otherwise than is (_ks._) or (_gs._) (when (_g_) is an _Explosive Consonant_) and (_ts._) wherefore I shall add nothing concerning them. Deaf Persons are to be diligently accustomed to pronounce these _Semi-vowels_, _n. ng. l. r._ also the following _Consonants_; _h. g. k. t._ with some kind of opening the _Mouth_, else they may joyn them sometimes with certain _Vowels_, not without a notable yawning, & a discordant noise. Now in general, Winter-time is fitter almost for to instruct the Deaf, because then they see the _Breath_ coming forth from the _Mouth_, whilst Pronounciation is in doing.