32. _When use the Interjection O?_
The letter O is a vocative particle, and should always be
used before nouns or pronouns in the absolute case by direct
address.--[_Ridpath._]

33. _When use Oh?_
In all cases where it is not followed by nouns, or pronouns, in
the vocative case.--[_Ridpath._]




ABBREVIATIONS.


1. _What is an abbreviation?_
One or more of the letters of a word standing for the whole word.

2. _What is the signification of A.C.S.?_
American Colonization Society.

3. _Give meaning A.B.C.F.M._
American Board of Commissioners for Foreign Missions.

4. _What is the signification AAA.?_
Amalgamation.

5. _What is the signification of Ang.-Sax.?_
Anglo-Saxon.