England, with her climate of more than vernal freshness, and in whose summer skies, and rich autumnal clouds, the observer of Nature may daily watch … - John Constable

The landscapes of Ruysdael present the greatest possible contrast to those of Claude, showing how powerfully, from the most opposite directions, genius may command our homage. In Claude's pictures, with scarcely an exception, the sun ever shines. Ruysdael, on the contrary, delighted in, and has made delightful to our eyes, those solemn days, peculiar to his country and to ours, when without storm, large rolling clouds scarcely permit a ray of sunlight to break the shades of the forest.

He seems to paint with tinted steam, so evanescent, and so airy.

I am anxious that the world should be inclined to look to painters for information about painting. I hope to show that ours is a regularly taught profession; that it is scientific as well as poetic; that imagination alone never did, and never can, produce works that are to stand by a comparison with realities; ; and to show, by tracing the connecting links in the history of landscape painting, that no great painter was ever self-taught.