Smithsonian miscellaneous collections
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چکیده
PURPOSE OF THE PAPER The quantitative investigation of the relationship between the amount of water vapor in the terrestrial atmosphere and the corresponding changes in the transmissibility of the latter to the incoming solar energy, is the primary object of this paper. Bouguer's formula, which will later be treated in detail, furnishes an analytical means for this study. As generally used, however, it would indicate that the absorption depends only on the amount of vapor present as an absorbent ; that is. the same absorption would be produced bv a given quantity of water in the form of vapor, whether the path were long through a small density, or short through a great densitv. In order to determine spectroscopically the amount of aqueous vapor present in our atmosphere, it is necessary that such a condition should be trne ; in such a case, only, is it immaterial what distribution of densities exists in the atmospheric strata. Janssen 1 finds, however, that certain oxygen bands do not satisfy this condition: neither does carbonic acid gas, according to Angstrom.Consequently it is important to find whether or not the absorption due to water vapor is expressed by Bouguer's formula in its ordinarv form.
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Smithsonian miscellaneous collections
The first part of this paper deals with the general geology and geography of the region from which the Cretaceous fishes of Ceara come, while the second part is a systematic description of the fishes themselves. The collection is especially important because it contains all of the species hitherto described from Ceara, besides three new genera and four new species. The large number of duplicate...
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By doctor E. MASCHA [The following paper on the " Structure of Wing-Feathers " gives an account of an investigation conducted by Doctor E. Mascha under the direction of Professor R. von Lendenfeld, of the Imperial German University in Prague. The original German text of this paper is to be published in the Zcitschrift fiir zvisscnschaftUchc Zoologic. Doctor von Lendenfeld, who was a competitor ...
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While engaged in the study of the Tertiary fauna of Coos Bay, Oregon, it became necessary for me to investigate the systematic position of certain forms of Volutes which were contained in it. Their relations to certain Upper Cretaceous forms had been assumed and they had even been referred to the same genus. An investigation of the question was made possible by the kindness of Dr. T. W. Stanton...
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