. The Methodist quarterly review. gard to the presence of hydrogen. TTe look forits symbol II, and find that its bright lines coincide preciselyin position and breadth with as many absorption lines in Alde-baran; while in Betelgeux no absorption bands are found cor-responding to the bright ones. The presence ofhydrogen is therefore con-cluded in the former, itsabsence in the latter. Soin the case of iron, (Fe.)We find four lines in eachof the spectra exactlycorresponding; we there-fore infer its presence,hi a similar manner thepresence of magnesium,I ) calcium, (6c?-.,)mercury, (Hg.,) anti
. The Methodist quarterly review. gard to the presence of hydrogen. TTe look forits symbol II, and find that its bright lines coincide preciselyin position and breadth with as many absorption lines in Alde-baran; while in Betelgeux no absorption bands are found cor-responding to the bright ones. The presence ofhydrogen is therefore con-cluded in the former, itsabsence in the latter. Soin the case of iron, (Fe.)We find four lines in eachof the spectra exactlycorresponding; we there-fore infer its presence,hi a similar manner thepresence of magnesium,I ) calcium, (6c?-.,)mercury, (Hg.,) antimo-ny, (So.,) tellurium, (Te.,)Bodiura, (Fa.,) bismuth,(/?/.,) thallium, (LI.,) areinferred in Aldebaran ;and calcium, sodium,bismuth, thallium, iron,m*l magnesium in Betel-p ux. The elements whosei-ri^ht lines have noCorresponding absorptiontanda are assumed ab-*• It will be noticedthere are many ab-* rption lines in each of«I»ectra which have corresponding brighthi the spectra ofof the numerous elc-Nvith whichof th Fig. they were compared. This would ue following inferences: first, thai BornetoMfila mav ex«lat lead eie- in these stars which do not occur upon: Wthj Second, there may be bright lines given by known 212 Spectrum Analysis. [April, terrestrial elements with which we are as jet unacquainted,and wliich future investigations rhay reveal; third, owing tothe temperature or pressure to which these bodies may be sub-jected, secondary spectra are formed. Whichever of thesealternatives may be correct, the number of terrestrial elementswhich are shown to exist upon these far-distant bodies aresufficient to establish quite a relationship between them am]our earth, as wrell as to render a closer acquaintance with themhighly desirable. A relation has also been established between the colors withwhich the stars shine and their spectra, and it has been shownthat these various colors are due to a difference in chemical andphysical constitution. Much variety in their phys
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