When, in July, she set off with Shelley and Clare on a short tour to the Valley of Chamounix, she took her MS. with her. They visited the Mer de Glace, and the source of the Arveiron. The magnificent scenery which inspired Shelley with his poem on “Mont Blanc,” and is described by Mary in the extracts from her journal which follow, served her as a fitting background for the most preternatural portions of her romance.

Tuesday, July 23 (Chamounix).—In the morning, after breakfast, we mount our mules to see the source of the Arveiron. When we had gone about three parts of the way, we descended and continued our route on foot, over loose stones, many of which were an enormous size. We came to the source, which lies (like a stage) surrounded on the three sides by mountains and glaciers. We sat on a rock, which formed the fourth, gazing on the scene before us. An immense glacier was on our left, which continually rolled stones to its foot. It is very dangerous to be directly under this. Our guide told us a story of two Hollanders who went, without any guide, into a cavern of the glacier, and fired a pistol there, which drew down a large piece on them. We see several avalanches, some very small, others of great magnitude, which roared and smoked, overwhelming everything as it passed along, and precipitating great pieces of ice into the valley below. This glacier is increasing every day a foot, closing up the valley. We drink some water of the Arveiron and return. After dinner think it will rain, and Shelley goes alone to the glacier of Boison. I stay at home. Read several tales of Voltaire. In the evening I copy Shelley’s letter to Peacock.

Wednesday, July 24.—To-day is rainy; therefore we cannot go to Col de Balme. About 10 the weather appears clearing up. Shelley and I begin our journey to Montanvert. Nothing can be more desolate than the ascent of this mountain; the trees in many places having been torn away by avalanches, and some half leaning over others, intermingled with stones, present the appearance of vast and dreadful desolation. It began to rain almost as soon as we left our inn. When we had mounted considerably we turned to look on the scene. A dense white mist covered the vale, and tops of scattered pines peeping above were the only objects that presented themselves. The rain continued in torrents. We were wetted to the skin; so that, when we had ascended halfway, we resolved to turn back. As we descended, Shelley went before, and, tripping up, fell upon his knee. This added to the weakness occasioned by a blow on his ascent; he fainted, and was for some minutes incapacitated from continuing his route.

We arrived wet to the skin. I read Nouvelles Nouvelles, and write my story. Shelley writes part of letter.

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Saturday, July 27.—It is a most beautiful day, without a cloud. We set off at 12. The day is hot, yet there is a fine breeze. We pass by the Great Waterfall, which presents an aspect of singular beauty. The wind carries it away from the rock, and on towards the north, and the fine spray into which it is entirely dissolved passes before the mountain like a mist.

The other cascade has very little water, and is consequently not so beautiful as before. The evening of the day is calm and beautiful. Evening is the only time I enjoy travelling. The horses went fast, and the plain opened before us. We saw Jura and the Lake like old friends. I longed to see my pretty babe. At 9, after much inquiring and stupidity, we find the road, and alight at Diodati. We converse with Lord Byron till 12, and then go down to Chapuis, kiss our babe, and go to bed.

Circumstances had modified Shelley’s previous intention of remaining permanently abroad, and the end of August found him moving homeward.

The following extracts from Mary’s diary give a sketch of their life during the few weeks preceding their return to England.

Sunday, July 28 (Montalègre).—I read Voltaire’s Romans. Shelley reads Lucretius, and talks with Clare. After dinner he goes out in the boat with Lord Byron, and we all go up to Diodati in the evening. This is the second anniversary since Shelley’s and my union.