Tyrwhitt pointed out that the Rowleian dialect was not English of the fifteenth century, nor of any century, but a grotesque jumble of archaic words of very different periods and dialects. The orthography and grammatical forms were such as occurred in no old English poet known to the student of literature. The fact that Rowley used constantly the possessive pronominal form _itts_, instead of _his_; or the other fact that he used the termination _en_ in the singular of the verb, was alone enough to stamp the poems as spurious. Tyrwhitt also showed that the syntax, diction, idioms, and stanza forms were modern; that if modern words were substituted throughout for the antique, and the spelling modernized, the verse would read like eighteenth-century work. "If anyone," says Scott, in his review of the Southey and Cottle edition, "resists the internal evidence of the style of Rowley's poems, we make him welcome to the rest of the argument; to his belief that the Saxons imported heraldry and gave armorial bearings (which were not known till the time of the Crusades); that Mr. Robert [_sic_] Canynge, in the reign of Edward IV., encouraged drawing and had private theatricals." In this article Scott points out a curious blunder of Chatterton's which has become historic, though it is only one of a thousand. In the description of the cook in the General Prologue to the "Canterbury Tales," Chaucer had written: "But gret harm was it, as it thoughte me, That on his schyne a mormal hadde he, For blankmanger he made with the beste." _Mormal_, in this passage, means a cancerous sore, and _blankmanger_ is a certain dish or confection--the modern _blancmange_. But a confused recollection of the whole was in Chatterton's mind, when among the fragments of paper and parchment which he covered with imitations of ancient script, and which are now in the British Museum,--"The Yellow Roll," "The Purple Roll," etc.,--he inserted the following title in "The Rolls of St. Bartholomew's Priory," purporting to be old medical prescriptions; "The cure of mormalles and the waterie leprosie; the rolle of the blacke mainger"; turning Chaucer's innocent _blankmanger_ into some kind of imaginary _black mange_.