16th Do not Puff up the Cheeks, Loll not out the tongue rub the Hands, or beard, thrust out the lips, or bite them or keep the Lips too open or too Close.
(pretty self-explanatory)

17th Be no Flatterer, neither Play with any that delights not to be Play’d Withal.
(don’t flatter, and don’t tease people who don’t like to be teased)

18th Read no Letters, Books, or Papers in Company but when there is a Necessity for the doing of it you must ask leave: come not near the Books or Writings of Another so as to read them unless desired or give your opinion of them unask’d also look not nigh when another is writing a Letter.
(don’t bury yourself in a book when others are around; don’t look over somebody’s shoulder)

19th let your Countenance be pleasant but in Serious Matters Somewhat grave.
(keep a nice expression but be serious when it’s appropriate)

20th The Gestures of the Body must be Suited to the discourse you are upon.
(keep your hand motions etc. appropriate to what you’re talking about)

21st: Reproach none for the Infirmaties of Nature, nor Delight to Put them that have in mind thereof.
(don’t make fun of people who can’t help the way they are)

22d Shew not yourself glad at the Misfortune of another though he were your enemy.
(be a good sport, even with people you don’t like)

23d When you see a Crime punished, you may be inwardly Pleased; but always shew Pity to the Suffering Offender.
(it’s ok to feel that justice has been done, but be sensitive to the punished one)

24th Do not laugh too loud or too much at any Publick Spectacle.

25th Superfluous Complements and all Affectation of Ceremonie are to be avoided, yet where due they are not to be Neglected.
(don’t be all gushy, but give a compliment when it’s deserved)