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Crossing the solar spectrum are hundreds and hundreds of dark lines. These could not at first be explained, because this fact of discriminative absorption was not known. We understand now. The sun's white light comes from the photosphere, but between us and the photosphere there is, as we have seen, another solar envelope of relatively cooler vapours--the reversing layer. Each constituent element in this outer envelope stops its own kind of light, that is, the kind of light made by incandescent atoms of the same element in the photosphere. The "stoppages" register themselves in the solar spectrum as dark lines placed exactly where the corresponding bright lines would have been. The explanation once attained, dark lines became as significant as bright lines. The secret of the sun's composition was out. We have found practically every element in the sun that we know to be in the earth. We have identified an element in the sun before we were able to isolate it on the earth. We have been able even to point to the coolest places on the sun, the centres of sun-spots, where alone the temperature seems to have fallen sufficiently low to allow chemical compounds to form.

In addition to this the earth revolves round the sun at a speed of more than a thousand miles a minute. Its path round the sun, year in year out, measures about 580,000,000 miles. The earth is held closely to this path by the gravitational pull of the sun, which has a mass 333,432 times that of the earth. If at any moment the sun ceased to exert this pull the earth would instantly fly off into space straight in the direction in which it was moving at the time, that is to say, at a tangent. This tendency to fly off at a tangent is continuous. It is the balance between it and the sun's pull which keeps the earth to her almost circular orbit. In the same way the seven other planets are held to their orbits.

Behind the lady who is bringing in the eggs is the under-under-nurse who is at the fire warming a towel. In the foreground we have the regulation midwife holding the regulation baby (who, by the way, was an astonishingly fine child for only five minutes old). Then comes the under-nurse--a good buxom creature, who, as usual, is feeling the water in the bath to see that it is of the right temperature. Next to her is the head-nurse, who is arranging the cradle. Behind the head-nurse is the under-under-nurse's drudge, who is just going out upon some errands. Lastly--for by this time we have got all round the chapel--we arrive at the Virgin's grandmother's-bodyguard, a stately, responsible-looking lady, standing in waiting upon her mistress. I put it to the reader--is it conceivable that St. Joachim should have been allowed in such a room at such a time, or that he should have had the courage to avail himself of the permission, even though it had been extended to him? At any rate, is it conceivable that he should have been allowed to sit on St. Anne's right hand, laying down the law with a "Marry, come up here," and a "Marry, go-down there," and a couple of such unabashed collars as the old lady has put on for the occasion?

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