A short time after his death, and during the year 1649, his brother Patrick published in one volume, entitled a “Treatise of Miscellany Questions,” a series of papers, twenty-two in number, on a variety of important topics, which appeared to be in a condition fit for the press. Though this is a posthumous production, and consequently without its author’s finishing corrections, it displays the same clearness, precision, and logical power, which characterise his other works. We are inclined to conjecture that these Essays, as we would now term them, were written at different times during the course of several years, and while he was studying the various topics to which they relate. Several of them are on subjects which were debated in the Westminster Assembly; and it is very probable that Gillespie wrote them while maturing his views on these points preparatory for those discussions in which he so greatly distinguished himself. This conjecture is strengthened by the curious and interesting fact, that a paper, which will be found beginning at page 109 of the part now printed for the first time from the MS., is almost identical, both in argument and language, though somewhat different in arrangement, with chapter viii. pages 115 to 120, of Aaron’s Rod. The arrangement in the Aaron’s Rod is more succinct than in the paper referred to, but its principles, and very much of the language, are altogether the same. May not this indicate Gillespie’s mode of study and composition? May he not have been in the habit of concentrating his mind on the leading topics of the subjects which he was studying, writing out pretty fully and carefully his thoughts on these topics, and afterwards connecting and arranging them so as to form one complete work? If so, then we may conclude that the Miscellany Questions contain such of these masses of separate thinking as Gillespie found no opportunity of using in any other manner, and, therefore, consented to their publication in their present form.