โ Scribed by Henry Hartshorne
No coin nor oath required. For personal study only.
Professor Henry Draper, in his recent paper upon the "Discovery of Oxygen in the Sun by Photography," etc., indicates his conclusion that the theory of the constitution of the solar spectrum must be modified, in view of the facts presented in his investigations. This conclusion is obviously true, so far, at least, as regards the demonstration of the existence of oxygen, and the great probability of that of several other substances not hitherto therein recognized, in the sun. But some other modification of the accepted theory of the spectrum, it appears to the writer, is also demanded by the same and by some other now known facts.
Professor Draper suggests that "the reason of the non-appearance of a dark line may be that the intensity of the light from a great thickness of ignited oxygen overpowers the effect of the photosphere." He adds that "such an explanation would necessitate the hypothesis that ignited gases, such as oxygen, give forth a relatively large proportion of the solar light."
This is a hypothesis of so considerable violence, in view of familiar facts, that there is room to examine whether another explanation may not be arrived at, which will include all the facts, some of which Professor Draper's observations seem to have brought into contradiction. Of course, the opposition cannot be in the facts themselves, but must be in our views of them. The apparent contradiction. referred to is thus alluded to by Professor Draper: "At first sight it seems rather difficult to believe that an ignited gas in the solar envelope should not be indicated by dark fines in the solar spectrum, and should appear not to act under the law ~a gas when ignite~ absorbs rays of the same refrangibility as those it emits.'" Then follows this important remark : "the substances hitherto investigate4 in the sun are really metallic vapors, Hydrogen probably coming under that rule. The non-metals obviously may behave differently." It is then added, "it is easy to speculate on the causes of such behavior." In the way of speculation thus indicated, the only suggestion
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