Abstract
DURING the last few decades, the main interests of astronomical research have shifted rapidly from the solar system outwards. Nevertheless, the planets have not been entirely neglected in recent research. The great light-gathering power of large modern telescopes has enabled spectrographs of very high dispersion to be used for the more detailed study of the spectra of the planets, and the great advances in the manufacture of plates sensitive to the infra-red region of the spectrum have made possible the investigation of a region of the spectrum the importance of which arises from the fact that the selective absorptions by planetary atmospheres lie mainly in this region.
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