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As the foregoing Treatise is written and published with an intention to communicate a discovery that will prove of infinite advantage to the loveliest of arts, in all its branches; the author, conscious of wanting the necessary qualifications of a writer in a language not natural to him, hopes for indulgence, for all the inaccuracies and improprieties of expression he may and must have fallen into: as to facts, he begs leave to assure the public, that nothing has been advanced but what is strictly true.
If any artist or others should in practising be at a loss or stand for any thing, the author shall always be willing and ready to give them farther light on any occasion.
The treatise on Practical Painting in general, which was to have been published together with this, as has been intimated to the public in an advertisement of the third of January, will be published as soon as possible; the author being engaged in a work of a very extensive nature, had not time to bring it in perfect order himself; a gentleman and friend of his has been so kind as to undertake the finishing and correcting of it; it will soon be ready for the press.