"So hopeless and worthless did the enterprise seem, at one time," says M. F. Sweetser, "that Charles Turner, the engraver, used the proofs and trials of effect as kindling paper. Many years later, Colnaghi, the great print-dealer, caused him to hunt up the remaining proofs in his possession, and gave him fifteen hundred pounds for them. 'Good God!' cried the old engraver, 'I have been burning bank-notes all my life.'... In later days three thousand pounds had been paid for a single copy of the Liber."

"The most obvious intention of the work," says Monkhouse, "was to show Turner's own power, and there never was, and perhaps never will be again, such an exhibition of genius in the same direction. No rhetoric can say for it as much as it says for itself in those ninety plates, twenty of which were never published. If he did not exhaust art or nature, he may be fairly said to have exhausted all that was then known of landscape art, and to have gone further than any one else in the interpretation of nature....

"Amongst his more obvious claims to the first place among landscape artists are his power of rendering atmospherical effects, and the structure and growth of things. He not only knew how a tree looked, but he showed how it grew. Others may have drawn foliage with more habitual fidelity, but none ever drew trunks and branches with such knowledge of their inner life.... Others have drawn the appearance of clouds, but Turner knew how they formed. Others have drawn rocks, but he could give their structure, consistency, and quality of surface, with a few deft lines and a wash; others could hide things in a mist, but he could reveal things through mist. Others could make something like a rainbow, but he, almost alone, and without color, could show it standing out, a bow of light arrested by vapor in mid-air, not flat upon a mountain, or printed on a cloud.... If we seek the books from which his imagination took fire, we have the Bible and Ovid; the first of small, the latter of great and almost solitary power. Jason, daring the huge glittering serpent; Syrinx, fleeing from Pan; Cephalus and Procris; Æsacus and Hesperia; Glaucus and Scylla; Narcissus and Echo. If we want to know the artists he most admired and imitated, or the places to which he had been, we shall find easily nearly all the former, and sufficient of the latter to show the wide range of his travel. In a word, one who has carefully studied the Liber has indeed little to learn of the range and power of Turner's art and mind, except his color and his fatalism."

In 1808, Turner was appointed professor of perspective in the Royal Academy, which position he held for thirty years, though he rarely gave lectures to students, owing to his confused manner and obscurity in the use of language. Ruskin says: "The zealous care with which Turner endeavored to do his duty is proved by a large existing series of drawings, exquisitely tinted, and often completely colored, all by his own hand, of the most difficult perspective subjects; illustrating not only directions of line, but effects of light, with a care and completion which would put the work of any ordinary teacher to utter shame. In teaching generally, he would neither waste time nor spare it; he would look over a student's drawing at the Academy, point to a defective part, make a scratch on the paper at the side, say nothing. If the student saw what was wanted, and did it, Turner was delighted; but if the student could not follow, Turner left him."

Turner this year moved to the Upper Mall, Hammersmith, where his garden extended to the Thames. In this he had a summer-house, where some of his best work was done. He still retained the Harley-Street house, and lived in it much the life of a recluse. Mr. Thornbury tells the following incident:—

"Two ladies called upon Turner while he lived in Harley Street. On sending in their names, after having ascertained that he was at home, they were politely requested to walk in, and were shown into a large sitting-room without a fire. This was in the depth of winter; and lying about in various places were several cats without tails. In a short time our talented friend made his appearance, asking the ladies if they felt cold. The youngest replied in the negative; her companion, more curious, wished she had stated otherwise, as she hoped they might have been shown into his sanctum or studio. After a little conversation he offered them wine and biscuits, which they partook of for the novelty, such an event being almost unprecedented in his house. One of the ladies bestowing some notice upon the cats, he was induced to remark that he had seven, and that they came from the Isle of Man."

Turner was fond of his pet cats, and would let no harm come to them. After he had moved, in 1812, to 47 Queen-Anne Street, one of his favorite pictures, "Bligh Shore" was used as a covering for a window. A cat desiring to enter the window scratched the picture severely, and was about to be punished for the offence, by Mrs. Danby, the housekeeper, when Turner said, "Never mind," and saved the cat from the whipping.

At his house in Twickenham, which he bought and rebuilt in 1813 or 1814, calling it Solus Lodge on account of his desire to be alone, and afterwards Sandycomb Lodge, the boys named him "Blackbirdy," because he protected the blackbirds in the adjacent trees, not allowing their nests to be robbed. Turner sold this place after having owned it about twelve years, because his aged father, whom he always called "Dad," was always working in the garden and catching cold.

The eccentric artist must have been at this time quite rich, as well as famous. He had painted "The Sun rising in Mist," in 1807; the well-known "Wreck of the Minotaur," in 1810; "Apollo killing the Python," in 1811; "Hannibal and his Army crossing the Alps in a Snowstorm," in 1812; and "Crossing the Brook," and "Dido building Carthage," in 1815. "The first ('Crossing the Brook')," says Monkhouse, "is the purest and most beautiful of all his oil pictures of the loveliness of English scenery, the most simple in its motive, the most tranquil in its sentiment, the perfect expression of his enjoyment of the exquisite scenery in the neighborhood of Plymouth. The latter ('Dido building Carthage'), with all its faults, was the finest of the kind he ever painted, and his greatest effect in the way of color before his visit to Italy."