Two such folds maybe distinguished, corresponding on a smaller scale to the belt of alpine tracts which fringe the plateau on the north-west.
In the west of Ireland and in the Faroes, where certain inland and lowland localities are still uncultivated, Plantage maritfma and other halophytes occur in quantity and side by side with some Alpine species, such as Dryas octopetala.
Ibex live habitually at a greater height than chamois or any other Alpine mammals, their vertical limit being the line of perpetual snow.
Denticornis, swarm in the ice-cold waters of the highest alpine tarns throughout the entire chain; and the former of these is also a characteristic inhabitant of pools formed from melting snow in the extreme north.
Carinthia possesses a great number of Alpine lakes, which, unlike the other Alpine lakes, lie in the longitudinal valleys.
Give abundance of air to the greenhouse, conservatory and alpine frame in mild weather, but use little water.
The best variety for culture in Britain is that with red female flowers; the light-flowered kinds are said to produce inferior wood, and the Siberian larch does not grow in Scotland nearly as fast as the Alpine tree.
In any case, however, the migration of these plants to the Alps must for the most part have taken place via the Arctic. The possibility of any extensive east to west migration having taken place direct from the Altai to the Alps seems excluded by the fact that 50 o ho of the arctico-altaic alpine plants are absent from the Caucasus.
In reply Cadorna detached two more divisions, the 9th and loth, from the general reserve in Friuli, to be held in reserve at Schio and Bassano, and gave an additional group of Alpine battalions to the I.
Grum-Grshimailo found on the Pamir the butterfly Colias nastes, a species characteristic of Labrador and Lapland; like the alpine plants which bear witness to a Glacial period flora in the Himalayas, this butterfly is a survival of the Glacial period fauna of the Pamir.