This last assertion Mr. Ottley disproves, by citing several instances of its occurrence in various works of Zell, as well as the marks of the unicorn, the two keys, and the capital Y, &c., shewing, as he says, that Koning has “_erred egregiously_.” He also says (note, p. 160,) “The supposed _initial of Philip the Bold_ is very doubtful. I have reason to believe that the paper on which it is found was made in Italy.” And he moreover shews, that he could not find it in any of Mr. Koning’s tracings, earlier than 1453. He himself saw it “in company with other papers which _he thought_ not to be older than 1438; but in a dated book he did not find it earlier than 1445.” “The letter Y,” says Mr. Koning, “is, without doubt, the initial of Ysabel of Portugal, who was married to Philip le Bon in 1430.” Mr. Koning sums up the third chapter of his book by saying, “the paper-marks prove that the said works were published between the years 1420 and 1440; since it appears from what has been said above, that the paper of the first Dutch edition (of the _Speculum_) which is evidently the most ancient, bears alone the marks which are the most ancient; that is to say, the arms of Bavaria which were used by the paper-makers in the reign of the Countess Jacqueline, and consequently, before the year 1428; and that the paper of the second or third edition of the _Speculum_ bears the letter P, the mark of the sovereign Philip of Burgundy, which certainly was not in usage until the year 1425.” Upon all this Mr. Ottley thus comments:--(pp. 163-164).