_Teeth Instruments_: Of the whole tribe there is certainly none more universal than the key; this ought to have three different hooks, and so that they may shift and unshift, according as the operation requires. The gum lancet I have no notion of, I never saw any occasion for it, and am apt to think it rather an hindrance to the operation. The instrument should be kept clean in the same manner as I have said before. 2. _Syringe_: Each box ought at least to have two. Ivory is the best substance they can be made of; they ought to be pretty thick and stout, as they are liable to warp. A small one with a neat pipe, slender, and a button to it, will be very useful for the clap, or other cases, where injections are requisite. A larger one for the ulcerated sore throat, or other the like cases, where quantities are required to be injected. 3. _Clyster Pipes_ and _Bladders_: There ought to be sundry. I would have them previously mounted; and to prevent the bladder from being decayed, or eaten up by vermin, or moths, fill them up with wormwood; a method I have found very effectual. When they are to be made use of, they are easily softened by a little lukewarm water. The general method of mounting the bladder on the pipe, is, by the assistance of a cork in the pipe, which is to be drawn by a string, when the clyster is injected; for my part, I found it always a hindrance; and therefore instead of the cork, I always chose to secure the whole with a string, tied with a slip knot, which when the pipe is introduced, is much more easily undrawn. _A clyster syringe_ of pewter, that holds at least a pint, or a pint and an half, is far more preferable at sea, and might easily be made with an additional pipe, by which a man may be the operator himself. 4. _Scales_ and _Weights_: This is a requisite article, in order to proportion the doses of medicines. The scales need scarce any description, as they require no more than their being of an equal length, and the whole in equilibrio. The _Apothecaries weights_ come in the following order, and signified by these characters: 1℔—A Pound is 12 Ounces.—℥xii. ℥i.—An Ounce is 8 Drachms.—ʒviii. ʒi.—A Drachm is 3 Scruples.—℈iii. ℈i.—A Scruple is 20 Grains.—gr.xx. These marks are generally stampt upon the pieces. As a pound and ounce are not generally used in the proportioning of doses, they are omitted in the common little boxes prepared for that purpose. The rest, drachms, scruples, and grains, are marked upon the requisite pieces; and which at the first inspection may easily be understood. I shall next proceed to another division of the chest or box. 5. _Splints_: Of those there should be at least four pair; two pair for broken legs, and two pair for broken arms. They are generally made of very thin deal boards, pasted on leather, and slit, so as to bend to the parts applied, sideways, but remain stiff length-ways.