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Rh few fabrications of Palæolithic forms, produced both by the notorious "Flint Jack" and by more humble practitioners in Suffolk. More skilful, however, have been some forgers in the North-East of London, whose productions can with difficulty be distinguished from the genuine articles.

As a rule, however, unless the forged implement has been put through some process, for the purpose of altering the character of its surface (which it is hardly ever worth the while of the ordinary forger to do, even supposing him to be acquainted with means for so doing), its surface can always be restored to its original condition, assuming it to have been smeared over with some substance in order to give it an appearance of antiquity, by thoroughly washing it in hot water. The surface of a newly-chipped flint can then in almost all cases be at once recognized by its peculiar dull lustreless appearance, especially if it be black flint, such as is best adapted for being chipped into form. Not unfrequently the metallic marks of the iron hammer with which it has been chipped out are visible, the angles are sharp and harsh, or, if smooth, show traces of having been ground, and the character of the chipping is usually different from that of genuine implements, as is also often the form.

The genuine specimens from the beds of River-drift, with but very few exceptions, present some one or more of the following characteristics; —glossiness of surface, dendritic markings, calcareous incrustations, and discoloration, varying, of course, with the nature of the beds in which they have lain. The angles are often somewhat smoothed, even if not distinctly waterworn; and when, as happens in some rare cases, the flint has remained unaltered in colour, and without presenting in a marked manner any of the characteristics above specified, its surface will, on close examination, be found dotted over at intervals with bright glossy spots, probably those at which for ages it has been in contact with other stones. The glossiness of surface so frequent on these implements appears to be partly due to mechanical, and partly to chemical causes. The polishing effect of the friction of sand on flints in the bed of a river, or even when lying on the surface of the ground, is well known; and the brilliantly-polished flakes not unfrequently found in the bed of the Seine at Paris, and those from the sandy heaths of Norfolk and Suffolk, afford examples of