In descriptive text matter, however, brackets should not be used where parentheses are clearly indicated.
_Rules for the Use of the Bracket_ 1.

To enclose words or phrases which are entirely independent of the rest of the sentence.
The enclosed words are usually comments, queries, corrections, criticisms, or directions inserted by some person other than the original writer or speaker.
2.

To enclose passages of doubtful authenticity in reprints of early manuscripts, special amendments to bills under legislative consideration, or any other portions of a text which need peculiar identification.
3.

In legal or ecclesiastical papers to indicate numerical words which may have to be changed, or to indicate where details are to be supplied.
This is the first [_second or third_] publication.
The officers shall remain in office [_here state the time_] or until their successors are duly qualified.
4.

To avoid the confusion caused by a parenthesis within a parenthesis.
5.