alone the points of particular interest can be worked out. To have done this in a proper manner from the spot at which the Discovery wintered in McMurdo Sound would have involved us in endless difficulties, for it would have entailed the risks of sledge travelling in mid-winter with an almost total absence of light. It would at any time require that a party of three at least, with full camp equipment, should traverse about a hundred miles of the Barrier surface in the dark and should, by moonlight, cross over with rope and axe the immense pressure ridges which form a chaos of crevasses at Cape Crozier. These ridges, moreover, which have taken a party as much as two hours of careful work to cross by daylight, must be crossed and re-crossed at every visit to the breeding site in the bay. There is no possibility even by daylight of conveying over them the sledge or camping kit, and in the darkness of mid-winter the impracticability is still more obvious. Cape Crozier is a focus for wind and storm, where every breath is converted, by the configuration of Mounts Erebus and Terror, into a regular drifting blizzard full of snow. It is here, as I have already stated, that on one journey or another we have had to lie patiently in sodden sleeping-bags for as many as five and seven days on end, waiting for the weather to change and make it possible for us to leave our tents at all. If, however, these dangers were overcome there would still be the difficulty of making the needful preparations from the eggs. The party would have to be on the scene at any rate early in July. Supposing that no eggs were found upon arrival, it would be well to spend the time in labelling the most likely birds, those for example that have taken up their stations close underneath the ice-cliffs. And if this were done it would be easier then to examine them daily by moonlight, if it and the weather generally were suitable: conditions, I must confess, not always easily obtained at Cape Crozier. But if by good luck things happened to go well, it would by this time be useful to have a shelter built of snow blocks on the sea-ice in which to work with the cooking lamp to prevent the freezing of the egg before the embryo was cut out, and in
