OBS. 6.—Here it is assumed, that “their observing the rule,” or “Tyro’s observing the rule,” is an ungrammatical phrase; and, several different methods being suggested for its correction, a preference is at length given to what is perhaps not less objectionable than the original phrase itself. The last form offered, “on observing the rule,” &c., is indeed correct enough in itself; but, as a substitute for the other, it is both inaccurate and insufficient. It merely omits the possessive case, and leaves the action of the participle undetermined in respect to the agent. For the possessive case before a real participle, denotes not the possessor of something, as in other instances, but the agent of the action, or the subject of the being or passion; and the simple question here is, whether this extraordinary use of the possessive case is, or is not, such an idiom of our language as ought to be justified. Participles may become nouns, if we choose to use them substantively; but can they govern the possessive case before them, while they govern also the objective after them, or while they have a participial meaning which is qualified by adverbs? If they can, Lowth, Murray, and others, are wrong in supposing the foregoing phrases to be ungrammatical, and in teaching that the possessive case before a participle converts it into a noun; and if they cannot, Priestley, Murray, Hiley, Wells, Weld, and others, are wrong in supposing that a participle, or a phrase beginning with a participle, may properly govern the possessive case. Compare Murray’s seventh note under his Rule 10th, with the second under his Rule 14th. The same contradiction is taught by many other compilers. See Smith’s New Grammar, pp. 152 and 162; Comly’s Gram., 91 and 108; Ingersoll’s, 180 and 199.