All office copy will follow it and all errors in copy from outside will be corrected by it.

Spellings differing from it will be regarded as errors, even though supported by other authorities.
This rule, however, is subject to one very important exception.

The author has an unquestionable right to choose his own dictionary or to use any spelling for which there is any authority, English or American.

If he has his own ideas on the subject of spelling he should be very careful that his manuscript is correctly spelled according to his ideas, and clearly written or typed.

He should also indicate on the manuscript the authority he wishes used in correcting the spelling in case of mistakes or illegible passages.
Every care should be taken to make the manuscript copy as correct as possible and as legible as possible.