A Treatise On the Forces Which Produce the Organization of Plants With An Append
A Treatise On the Forces Which Produce the Organization of Plants With An Append
Draper John William
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251. At one time much stress was laid on the power which certain media, such as bichromate of potash and quadrosulphuret of lime, possess in depriving a ray of its chemical force. This argument is still resorted to by inaccurate writers, as affording a very popular and palpable proof that light and the tithonic rays are different ex- istences. " If, " it is observed, " a ray of light is passed through a solution of quadro- sulphuret of lime, and is then received on paper covered with chloride o...f silver, it is found that the light alone has gone through, and the chemical rays have been absorbed. The one, therefore, exists independent of the other. " When I first observed the power of these yellow solutions, this was the conclusion I came to (Ap. , 410, 511). But the theory of ideal coloration, presently to be explained, deprives this argument of much of its force ; for the rays that are transmitted by such a solution are yellow rays of light, and yellow tithonic rays ; in these the chloride of silver does not change, its decompo- sition being brought about by the blue tithonic rays which have been absorbed along OTHER INVISIBLE PRINCIPLES IN THE SUNBEAM.
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