Titles
The proper use of titles forms an important item in letter-writing. The slightest hesitancy on this point shows a lack of culture on the part of the writer that lowers him at once in the eyes of the recipient.
The ordinary social titles used are simple and familiar. These are: Mrs., Madam, Miss, for women; Mr., Esq., Messrs., Sir, for men, and Master for boys.
Of course, in writing to an acquaintance, while the outer address retains all its formality, the commencement will be whatever is warranted by the degree of friendship between the parties.