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These basalts were covered with a mammiform substance, which I vainly sought on the Peak of Teneriffe, and which is known by the names of volcanic glass, glass of Muller, or hyalite: it is the transition from the opal to the chalcedony. We struck off with difficulty some fine specimens, leaving masses that were eight or ten inches square untouched.
For the last twenty minutes his spirits had been slowly sinking before the drifting procession past the carriage windows of dull gray and brown hills mammiform in shape, but so cold and sterile in expression that the swathes of yellow mist which lay in their hollows, like soiled guipure, seemed a gratuitous affectation of modesty.
There are, also, other very regular, mammiform hillocks, composed of stratified lava, and surmounted by circular, steep-sided hollows, which, I suppose have been formed by a body of gas, first, arching the strata into one of the bubble- like hillocks, and then, blowing off its summit.
The skin of the large hairy naevus, as well as that of the smaller ones, was stated by Schulz to have been in the main thickened, in part uneven, verrucose, from very light to intensely dark brown in color; the consistency of the larger mammiform and smaller tumors soft, doughy, and elastic. The case was really one of large congenital naevus pilosus and fibroma molluscum combined.
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