Never "avail" yourself of an invitation. Above all, never speak or
write of an invitation as "an invite." It is neither good breeding nor
good English.

Notes of invitation and reply should be written on small paper of the
best quality, and enclosed in envelopes to correspond.

A gentleman should never use sealing-wax of any colour but red, nor
paper of any hue but white. Fancy papers, fantastic borders, dainty
coloured wax, and the like elegant follies, are only admissible in the
desk of a lady.

Never omit the address and date from any letter, whether of business,
friendship, or ceremony.

Letters in the first person, addressed to strangers, should begin with
"Sir," or "Madam," and end with "I have the honour to be your very
obedient servant." Some object to this form of words from a mistaken
sense of pride; but it is merely a form, and, rightly apprehended,
evinces a "proud humility," which implies more condescension than a
less formal phrase.

At the end of your letter, at some little distance below your
signature, and in the left corner of your paper, write the name of the
person to whom your letter is addressed; as "Sir James Dalhousie," or
"Edward Munroe, Esquire."

It is more polite to write Esquire at full length than to curtail it
to Esq.