§ 17. It was not, however, as we saw, merely to locks of hair, but to serpents, that the Greeks likened the dissolving of the Medusa cloud in blood. Of that sanguine rain, or of its meaning, I cannot yet speak. It is connected with other and higher types, which must be traced in another place.[8] But the likeness to serpents we may illustrate here. The two Plates already given, 70 and 71 (at page 127), represent successive conditions of the Medusa cloud on one of the Cenis hills (the great limestone precipice above St. Michel, between Lanslebourg and St. Jean di Maurienne).[9] In the first, the cloud is approaching, with the lee-side cloud forming beyond it; in the second, it has approached, increased, and broken, the Medusa serpents writhing about the central peak, the rounded tops of the broken cumulus showing above. In this instance, they take nearly the forms of flame; but when the storm is more violent, they are torn into fragments, and magnificent revolving wheels of vapor are formed, broken, and tossed into the air, as the grass is tossed in the hay-field from the toothed wheels of the mowing-machine; perhaps, in common with all other inventions of the kind, likely to bring more evil upon men than ever the Medusa cloud did, and turn them more effectually into stone.[10] § 18. I have named in the first volume the principal works of Turner representing these clouds; and until I am able to draw them better, it is useless to say more of them; but in connection with the subject we have been examining, I should be glad if the reader could turn to the engravings of the England drawings of Salisbury and Stonehenge. What opportunities Turner had of acquainting himself with classical literature, and how he used them, we shall see presently. In the meantime, let me simply assure the reader that, in various byways, he had gained a knowledge of most of the great Greek traditions, and that he felt them more than he knew them; his mind being affected, up to a certain point, precisely as an ancient painter's would have been, by external phenomena of nature. To him, as to the Greek, the storm-clouds seemed messengers of fate. He feared them, while he reverenced; nor does he ever introduce them without some hidden purpose, bearing upon the expression of the scene he is painting. § 19. On that plain of Salisbury, he had been struck first by its widely-spacious pastoral life; and secondly, by its monuments of the two great religions of England--Druidical and Christian. He was not a man to miss the possible connection of these impressions. He treats the shepherd life as a type of the ecclesiastical; and composes his two drawings so as to illustrate both.