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 cepts, and what may be effected by them, we need only appeal to his own example.

To this enumeration of the productions of Leonardo’s pen, and in contradiction to the fact already asserted, that no part of his collections was ever arranged or prepared for publication by himself, it is probable we may be told we should add tracts on Motion; on the Equilibrium of bodies; on the nature, equilibrium, and motion of Water; on Anatomy; on the Anatomy of an horse; on Perspective; and on Light and Shadow: which are either mentioned by himself in the Treatise on Painting, or ascribed to him by others. But as to these, there is great reason for supposing, that, though they might be intended, they were never actually drawn up into form. Certain it is, that no such have been ever given to the world, as those before noticed are the only treatises of this author that have yet appeared in print; and even they have already been shewn to be no more than extracts from the immense mass of his collections of such passages as related to the subjects on which they profess to give intelligence. If any tracts therefore in his name, on any of the above topics, are any where exist- Rh