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Such is the classification of which Morison spoke so slightingly in the Dialogus: though the character of the leaf is not made so much of as his criticism implied. There is no need to dwell upon the strained relations that arose between Ray and Morison; it may suffice to say that Morison laid himself open to the charge of jealousy, and that Ray never forgave the criticisms, both written and oral, that Morison had made on him. Those who are interested in the unfortunate quarrel will find an account of it, with a most loyal apology for Morison, in Blair's Botanical Essays (1720). Ray may certainly be acquitted of plagiarism which is suggested by Blair, for he had no opportunity of studying Morison's system in its entirety: since, as already explained, it was not published in a complete form until the appearance of the Sciagraphia in 1720, long after Ray's death. When Ray wrote the Tables of Plants for Dr Wilkins, not even the Preludia Botanica had been published: the only work that he produced after the publication of both parts of Morison's Historia was the last edition of his Methodus