apricots, and above all the currant and the vine which give us our dried currants and raisins. But the supply of water in the rivers is limited, for the rivers are not broad or deep, in spite of their great length. One of the chief difficulties of all irrigation schemes is to avoid damage to the interests of people living lower down the stream, or interference with the navigation. In this matter the interests of all three States of the Commonwealth must be considered, since the Murray basin is divided among them. As we have already noticed in the case of Queensland and New South Wales, the State boundaries only coincide in part with natural features of the country. The whole character of the river basin depends on the distribution of the rainfall. In the case of all three States there is a similar arrangement: first the coast belt, which is more varied and irregular in Queensland and Victoria than in New South Wales; then the highland edge, and then the back slope with a zone of moderate rainfall which shades off gradually into desert conditions. This zone narrows as we come southwards until it almost disappears in South Australia. But before following it out into this last State we will cross Bass Strait to visit Tasmania. Victoria, though a mere corner of the Australian continent, is about the size of Great Britain, while Tasmania is not very much smaller than Ireland, and both could support a very dense population. We must bear these facts in mind during our rapid journey through the country, since the maps in our atlases, for the most part, give us utterly wrong impressions as to the area of Australia. If we look at a chart showing the depths of the sea, we may 34 notice that Bass Strait is shallow while the surrounding seas are deep. From Wilson Promontory we can trace a connexion through Flinders and Cape Barren Islands, to the north-east horn of the curved coast of Tasmania. A similar bridge runs through from the north-west horn, through the Hunter Islands and King Island. We may be reminded of the shallows of the English Channel and the North Sea, and can easily imagine that Tasmania, like England, at some very remote period formed part of the neighbouring continental mainland. We find, moreover, a general similarity between the plants and animals on the opposite sides of the Strait; but there are also some marked differences which suggest that Tasmania was separated very long ago and so has had a peculiar and isolated development.