21. SEEING, sometimes made a copulative conjunction, is the imperfect participle of the verb see. Used at the head of a clause, and without reference to an agent, it assumes a conjunctive nature.
22. SINCE is conjectured by Tooke to be "the participle of Seon, to see," and to mean "seeing, seeing that, seen that, or seen as."—Diversions of P., Vol. i, pp. 111 and 220. But Johnson and others say, it has been formed "by contraction from sithence, or sith thence, from sithe, Sax."—Joh. Dict.
23. THAN, which introduces the latter term of a comparison, is from the Gothic than, or the Anglo-Saxon thanne, which was used for the same purpose. 24. THAT, when called a conjunction, is said by Tooke to be etymologically the same as the adjective or pronoun THAT, the derivation of which is twice spoken of above; but, in Todd's Johnson's Dictionary, as abridged by Chalmers, THAT, the conjunction, is referred to "thatei, Gothic;" THAT, the pronoun, to "that, thata, Gothic; thæt, Saxon; dat, Dutch."
25. THEN, used as a conjunction, is doubtless the same word as the Anglo-Saxon Thenne, taken as an illative, or word of inference.
26. "THOUGH, allow, is [from] the imperative Thaf, or Thafig, of the verb Thafian or Thafigan, to allow."—Tooke's Diversions, Vol. i, pp. 111 and 150.
27. "UNLESS, except, dismiss, is [from] Onles, the imperative of Onlesan, to dismiss."—Ib.
28. WHETHER, a corresponsive conjunction, which introduces the first term of an alternative, is from the Anglo-Saxon hwæther, which was used for the same purpose.
29. YET, nevertheless, is from "Get, the imperative of Getan, to get."—Tooke.
SECTION IX.—DERIVATION OF PREPOSITIONS.
The following are the principal English Prepositions, explained in the order of the list:—