Sentence:  Though we have, in the notes under the thirteenth rule of the Grammar, explained in general the principles, on which the <WSD>time</WSD> of a verb in the infinitive mood may be ascertained, and its form determined; [...] <!-- rest of the sentence: yet, as the subject is curious and important, and the practice of good writers upon it is very discordant, we presume it will not be unaceptable to the young student of grammar, if we produce a few additional observations calculated to settle his judgement on this contested point. ---> 
Meaning of the word marked with <WSD> tags:  Tense.