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A white skin, on the other hand though this is more doubtful perhaps economizes sun-heat in colder latitudes. Brown, yellow and the so-called red are intermediate tints suitable to intermediate regions.
It spreads a rich brown mantle over the desolate ground in the spring before the grass has sprouted, and at the first touch of sun-heat its young fronds come rearing up full of faith and hope through the midst of the last year's ruins.
The story of its death is not unlike that of its companion already described, though the declivity of its channel, and its uniform exposure to sun-heat prevented any considerable portion of its current from becoming torpid, lingering only well up on the Mountain slopes to finish their sculpture and encircle them with a zone of moraine soil for forests and gardens.
But the winter temperatures, over the same latitudes in Mars, must be very much lower; and it must require a proportionally larger amount of its feeble sun-heat to raise the surface even to the freezing-point, and an additional very large amount to melt any considerable depth of snow.
The majority would, I think, answer at once About 24° F. Nearly as many would perhaps say 48° F. is 16° above the freezing point; therefore half the heat received would bring us down to 8° above the freezing point, or 40° F. Very few, I think, would realise that our share of half the amount of sun-heat received by the earth would probably result in reducing our mean temperature to about 100° F. below the freezing point, and perhaps even lower.
Air well by opening windows and door several hours before the fowls go to roost. Cloth for Brooding Houses. Would some good grade of white cloth on a frame do as well, or would it be better than glass, for a brooder house, or would it keep out too much sun-heat? Cheesecloth, not heavy cloth, would be better than glass, so far as the sun is concerned.
The more correct view seems to be that the loss of heat by radiation is increased so much through the rarity of the air above it as to more than counterbalance the increased insolation, so that though the surface of the earth at a given altitude may receive 10 per cent. more direct sun-heat it loses by direct radiation, combined with diminished air and cloud-radiation, perhaps 20 or 25 per cent. more, whence there is a resultant cooling effect of 10 or 15 per cent.
I wish, from the bottom of my soul, that he may be enjoying similar pleasures with those which I am now enjoying with all that newness of sensation; that voluptuous correspondence of the blood and flesh about me with breeze and sun-heat, which makes convalescence more than repay one for disease. I parted from Poole with pain and dejection, for him, and for myself in him.
The air was still, but less oppressive, the cruelty of sun-heat having gone out of it and only a suavity remaining.
We must therefore always remember that, very nearly if not quite, the whole of the warmth we experience on the earth is derived from the sun. In order to understand the immense significance of this conclusion we must know what is meant by the whole heat or warmth; as unless we know this we cannot define what half or any other proportion of sun-heat really means.
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