Table of contents

Volume 68

Number 400, 1956 February

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Notes From Observatories

57
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VARIATIONS IN THE SPECTRUM OF 89 HERCULIS

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62
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LIGHT-VARIATION OF 89 HERCULIS

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63
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NOTE ON MAGNITUDE SCALES

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64
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THE SPECTRUM OF A GEMINID METEOR

, , , and

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70
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MAGNETIC FIELD OF RR LYRAE

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70a
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TECHNETIUM IN THE N-TYPE STAR 19 PISCIUM

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71
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SUGGESTED SPECTROGRAPHIC OBSERVATIONS OF MARS

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74
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SUMMARY OF MOUNT WILSON MAGNETIC OBSERVATIONS OF SUNSPOTS FOR SEPTEMBER AND OCTOBER, 1955
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77
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COMET NOTES

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Reviews

79
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REVIEWS
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84
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GENERAL NOTES
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86
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MINUTES OF THE MEETING OF THE DIRECTORS, NOVEMBER 18, 1955
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5
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THE PERIOD-LUMINOSITY RELATION OF THE CEPHEIDS

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17
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THE LIGHT-RATIO AND THE SPECTRUM OF THE SECONDARY COMPONENT OF THE ECLIPSING BINARY 31 CYGNI

and

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23
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THEORETICAL LINE INTENSITIES AND THE SPECTRUM OF TAU SCORPII

, , and

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27
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EPSILON AURIGAE

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38
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THE NATURE OF THE LUNAR MARIA

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46
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THE INTERSTELLAR SODIUM LINES IN A REGION OF SCUTUM

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55
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ASPECT OF THE HEAVENS FOR MARCH AND APRIL, 1956

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