If two spellings are given in the dictionary, the first cited is preferable.

Follow these spellings:

Write: Parcel post, not parcels post.

Be sure that proper names are spelled uniformly throughout a story.

Use the form in instead of en in such words as indorse, inclose.

Write it: Trade unions, not trades unions.

Use no diphthongs when they can be avoided. Write: anesthetic, esthetic, medieval, maneuver, subpena, homeopathic.

Follow the American spelling on checks, tires, curb, pajamas, disregarding the British cheques, tyres, kerb, pyjamas.

Make the plural of Knight Templar, Knights Templar.