5. In medical matter roman is used instead of italic for scientific terms.
6. For names of stars or constellations in astronomical matter.
7. In resolutions for the word _Resolved_.
In MS. one line drawn beneath a word or sentence signifies that it is to be put in italic. { 65}
Dates are not usually abbreviated in writing or in regular text matter; but when necessary the following rules may be followed:
1. Do not use _st_, _d_, _rd_, or _th_ after a date given in figures; e.g., _June 3_, not _June 3d_ or _3rd_. If a date is spelled out, the rule is as follows: e.g., _June the third_, not _June three_.
2. Do not use _ult._, _inst._, or _prox._, but always name the month: e.g., _Oct. 25_, not _25th ult._, _Nov. 10_, not _10th inst._
3. Use generally accepted abbreviations for the names of months when the day of the month is also given, and prefer dates in order of day, month, and year: e.g., _7 Jan., 1912_. When the name of the month is used alone or followed only by the year, do not abbreviate: e.g., _February, 1912_, not _Feb., 1912_.
4. For ordinary purposes use these as the generally accepted abbreviations for the months and days of the week:
Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.
5. In tables and wherever matter must be _greatly_ condensed use the Dewey dates, { 66} which are the briefest possible without ambiguity, in the order of (_a_) day of week, (_b_) day of month, (_c_) month, (_d_) year. These abbreviations are not desirable except in tabular matter.
Ja. F. Mr. Ap. My. Je. Ju. Ag. S. O. N. D.
1. Abbreviate _company_ in firm names: e.g., _John Brown & Co._
2. Spell out names of companies, railroads, etc., using the ampersand (&) only between proper names: e.g., _Brown & Sharpe Manufacturing Company_; _Norfolk & Western Railroad_; but _American Smelting and Refining Company_. If names of railroads are abbreviated, use no space between the letters: e.g., _N.Y._, _N.H. & H.R.R._
3. Abbreviate _United States_ when immediately associated with the name of an officer of the army or navy, as _Lieut. John Doe, U.S.A._; when it is the name of an organization of the army or navy, as _First Regiment U.S.V._; when preceding the name of a government vessel, as _U.S.S. Brooklyn_.