The Philosophical magazine; a journal of theoretical, experimental and applied physics . retical curves, as to general form, with the curve of solarenergy beyond the atmosphere. In fig. 4 the se{)arate pointscorrespond to the numbers given by Prof. Langley in No. 9of the table 120 of his work, Researches on Solar Heat, & dotted curvt^ has been traced from curve 3 of plate 15 ofthe same work, and the continuous curve gives the theoreticalcurve represented by the equation I;,=AeA^\-«, (17) and passing through the observed points A and B. To take account of the dillcrenci^ between theorv and
The Philosophical magazine; a journal of theoretical, experimental and applied physics . retical curves, as to general form, with the curve of solarenergy beyond the atmosphere. In fig. 4 the se{)arate pointscorrespond to the numbers given by Prof. Langley in No. 9of the table 120 of his work, Researches on Solar Heat, & dotted curvt^ has been traced from curve 3 of plate 15 ofthe same work, and the continuous curve gives the theoreticalcurve represented by the equation I;,=AeA^\-«, (17) and passing through the observed points A and B. To take account of the dillcrenci^ between theorv and ol)ser-vation (a greater ditlerence in this ease than in tiie ])rece(lingone), we must remember that not only equation (17), but also of Energy in the Spectra of Solids. 435 the more general formula (10), can only be considered as afirst approximation ; that tlu^se equations have been deducedfor solid bodies, and not for such bodies as the sun ; and,lastly, that in our atmosphere, as well as in the colder regionsof the gas surrounding the sun there must occur the pheno- Fi-. menon of degradation of the radiant energj. In consequenceof this effect, which has not been eliminated by Prof. Langley,a portion of the more refrangible radiations would be trans-formed into longer undulations, which would tend to modifythe spectral diagram exactly in the sense indicated by obser-vation. Recognizing the provisionalcharacter of the ideas suggestedin this paper, I hope that it will be possible to give them agreater development and precision when once we are in pos-session of more complete experimental data to guide us in thisstudy. We should then be able to express by one sufficientlyexact formula the law of distribution of radiant energy as afunction of the wave-length and the temperature of the a formula would be of great service in all questionsarising in the study of spectra. [ 430 ] LIV. Notices respecting Neio Books. The Tesihifj of Materials of Construction. A Text-
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