Pictures, too, provided associationist focus when recalled in a garden: the most obvious instance being the probable allusion to Claude at Stourhead.[11] Yet the actual influence of pictures on landscape gardens has been generally exaggerated.[12] Where they were perhaps a force seems to have been in articulating the mental and emotional reaction of visitors. When Walpole praises William Kent for realizing in gardens "the compositions of the greatest masters in painting",[13] I suspect that he is in part rationalizing his own associationalist instinct, when at Hagley he was reminded of Sadeler's prints or of the Samaritan woman in a picture by Nicolas Poussin. Allusions to pictures were a means of focusing evanescent mood.
Gilpin, too, organizes his characters' responses in pictorial focus. The _Advertisement_ again alerts the reader to these studied painterly aims. Once inside the gardens Callophilus sees pictures everywhere: variously disposed objects "make a most delightful Picture" (p. 14), while on at least three occasions in the first half-dozen pages the ruins, prospects, and "Claro-obscuro" of trees are discussed in terms that suggest how his habits of vision have been educated in front of painted or engraved landscapes which in their turn are recalled to provide a suitable vocabulary for his experiences.[14] Even Polypthon invokes the syntax of painting (pp. 25 and 41) to formulate his reactions to scenery.
It is in these painterly preconceptions of the characters and in Polypthon's account of Scottish scenery (pp. 23-4) that hints of Gilpin's later career are announced: the second edition of the _Dialogue_ even talks of his "Observations" on Stowe, a term that became a standard ingredient in the titles of his picturesque tours. The education of sight by the study of paintings and prints was clarified and expounded in the _Essay on Prints_, written at least by 1758 and published ten years later. The picturesque tours themselves were started in the 1770s and published from 1782 onwards. In them Gilpin refines and enlarges upon the methods and ideas of his Stowe _Dialogue_. The adjudication between a taste for natural beauties (what his _Three Essays_ term the "correct knowledge of objects")[15] and the inclination to adjust them according to painterly criteria (in 1792 termed "scenes of fancy") is more sophisticated and consistent. He still delights in the variety of a landscape; but the roughness that Stowe only occasionally allowed becomes one of his guiding rules in appraising scenery.