more difficulty; and in particular when the artist, whose reputation is wholly founded upon that of his master, represented himself in foreign parts, as the disciple of men of celebrity, whom he scarcely knew by sight. Of this we have an example in Agostino Tassi, and more recently in certain _soidisant_ disciples of Mengs; to whom it scarcely appears that he ever so much as said, "_Gentlemen, how do you do_?" Finally, the reader will find some less obvious notices relating to the name, the country, and the age of different artists. The deficiency of our Dictionaries in interesting names, together with their inaccuracy, are common subjects of complaint. I can excuse the compilers of these works; I know how easily we may be misled in regard to names which have been often gathered from vulgar report, or even from authors who differ in point of orthography, some giving opposite readings of the same name. But it is quite necessary that such mistakes should once for all be cleared up. The index of this work will form a new Dictionary of Painters, certainly more copious, and perhaps more accurate than usual, although it might be still further improved, especially by consulting archives and manuscripts.[14] The second object which I had in view was to advance the interests of the art as much as lay in my power. It was of old observed that examples have a more powerful influence on the arts than any precepts can possess; and this is particularly true in respect to painting. Whoever writes history upon the model of the learned ancients, ought not only to narrate events, but to investigate their secret sources and their causes. Now these will be here developed, tracing the progress of painting as it advanced or declined in each school; and these causes being invariable, point out the means of its improvement, by shewing what ought to be pursued and what avoided. Such observations are not of importance to the artist alone, but have a reference also to other individuals. In the Roman school, during its second epoch, I perceive that the progress of the arts invariably depends on certain principles universally adopted in that age, according to which artists worked, and the public decided. A general history, by pointing out the best maxims of art, may contribute considerably to make them known and regarded; and hence artists can execute, and others approve or direct, on principles no longer uncertain and questionable, nor deduced from the manner of a particular school, but founded on maxims unerring and established, and strengthened by the uniform practice of all schools and all ages. We may add, that in a history so diversified, numerous examples occur suited to the genius of different students, who have often to lament their want of success from this circumstance alone, that they had neglected to follow the path in which nature had destined them to tread. On the influence of examples I shall add no more: should any one be desirous also of