No art manifestation is really isolated. However new it may seem, it is always based upon the previous epochs. The true masters do not give lessons, because art cannot be taught, but they set the example. To admire them does not mean to imitate them: it means the recognition in them of the principles of originality and the comprehension of their source, so that this eternal source may be called to life in oneself, this source which springs from a sincere and sympathetic vision of the aspects of life. The Impressionists have not escaped this beautiful law. I shall speak of them impartially, without excessive enthusiasm; and it will be my special endeavour to demonstrate in each of them the cult of a predecessor, for there have been few artistic movements where the love for, and one might say the hereditary link with, the preceding masters has been more tenacious.