IN spectroscopic literature there are many casual references to a continuous background in the vacuum tube spectra of various gases, such as oxygen, chlorine, etc. Usually these observations appear to ...

MR. W. M. H. GREAVES 1 has made certain objections to my tentative explanation of secondary maxima in the continuous spectra of novæ, etc. 2, because the observations of Nova Herculis 1934 made by ...