Believing him an honest man, we elected him treasurer.
We constituted our Secretary a depositary of German books.
I consider him a gentleman.
OBS. 23. Of the terms in apposition, one is the subject, and the other the predicate, of to be, understood (“They made him to be their ruler”). The rule might, therefore, be worded thus: When, of two terms in apposition, one is predicated of the other, no comma is required.
25. In a compound sentence, the comma is often inserted where a verb is omitted.
In literature, our taste will be discovered by that which we give; our judgment, by that which we withhold.
Wit consists in finding out resemblances; judgment, in discerning differences. {p110}
In the pursuit of intellectual pleasure lies every virtue; of sensual, every vice.
Sheridan once observed of a certain speech, that all its facts were invention, and all its wit, memory.
OBS. 24. But sometimes the comma is not inserted: especially when the style is lively; when the clauses have a common relation to something that follows; or when they are connected by a conjunction.