[21.] Co. and Company. Co. should be set in capitals (CO.) when the firm name is in capitals. The name JOHN BROWN’S Co. is unsightly. Unless Co. is the style of the company, or incorporation, spell out the word. In Co’s no period is needed after the o. De Vinne’s Correct Composition, page 291.
[22.] Credits. See paragraph [52]. Credits at the end of matter are best set in italic lower-case, without any em dash to connect the credit with the quotation. See De Vinne’s Correct Composition, page 150.
[23.] Dates. When the numeral precedes the name of the month it may be written as the 28th of November, but when the numeral follows, it should be November 28. In 2d, 3d, and like abbreviations, there is no need of n, as in 2nd.
Years. Two consecutive years should be run thus: During 1897-98, and not 1897-8. It is proper to say the heroes of ’49. See paragraph [24].
[24.] Figures. Commas are not needed in four figures, as: 1897, 5798. The comma should not be inserted between figures expressive of dates, as in June, 1898.
Numbers of infrequent occurrence should be spelled out rather than put in roman numerals. The engine weighed five thousand tons, there were fifty-two gallons in the barrel, there were seventeen thousand men in the regiments. See paragraph [17].
[25.] Hours. Print 11.30 a. m., and not 11:30 a. m. Use the period rather than the colon. See paragraph [18].
26. Month, etc. Month, inst., prox., and ult., often abbreviated in letters, are improper in all first-class work. Spell out the name of the month, as March and January, not Mar. and Jan. Spell out days of the week.
27. MISCELLANEOUS.
[(1)] e. g. for exempli gratia, i. e. for id est, q. v. for quod vide, viz. for videlicet or to wit, etc. for et cetera, are barely tolerated in good work and are discarded by many houses. If authors will use such symbols they should spell them out. Italic is not needed in these examples. See De Vinne’s Correct Composition, page 41.