At Yfre, two miles further, I noticed young kids, under whose chins, at the commencement of the throat, were a pair of tubercles, like those sometimes seen in pigs, about an inch long, of the thickness of their mother's nipples, and clothed with a few scattered hairs. Of their use I am ignorant. Near the church of Tierp runs a stream, whose bank on the side where it makes a curvature is very high and steep, owing to timber placed close to the water. The great power of a current, and the way in which it undermines the ground, is exceedingly visible at this place. Hence the strongest earthen ramparts, made with the greatest expense and labour, are often found insufficient to secure the foundations of large palaces or churches in some situations. But where timber has been used, the attacks of water are little to be dreaded. On both sides of the church were several small sepulchral mounds. It now grew late, and I hastened to Mehede, two miles and a half further, where I slept. _May 13._ Here the Yew (_Taxus baccata_) grows wild. The inhabitants call it Id or Idegran. The forest abounded with the Yellow Anemone (_Anemone ranunculoides_), which many people consider as differing from that genus. One would suppose they had never seen an Anemone at all. Here also grew Hepatica (_Anemone Hepatica_) and Wood Sorrel (_Oxalis Acetosella_). Their blossoms were all closed. Who has endowed plants with intelligence, to shut themselves up at the approach of rain? Even when the weather changes in a moment from sunshine to rain, though before expanded, they immediately close. Here for the first time this season I heard the Cuckoo, a welcome harbinger of summer. Having often been told of the cataract of Elf-Carleby, I thought it worth while to go a little out of my way to see it; especially as I could hear it from the road, and saw the vapour of its foam, rising like the smoke of a chimney. On arriving at the spot, I perceived the river to be divided into three channels by a huge rock, placed by the hand of Nature in the middle of its course. The water, in the nearest of these channels, falls from a height of twelve or fifteen ells, so that its white foam and spray are thrown as high as two ells into the air, and the whole at a distance appears like a continual smoke. On this branch of the cascade stands a saw-mill. The man employed in it had a pallid countenance, but he did not complain of his situation so much as I should have expected. It is impossible to examine the nature of the inaccessible black rock over which the water precipitates itself. Below this cataract is a salmon fishery. A square net, made of wicker work, placed at the height of an ell above the water, is so constructed that the salmon when once caught cannot afterwards escape.