The SciencesNature's Cross-Word PuzzlesTypical Examples of a Kind of Indoor Sport Indulged in by a Few Astrophysical Fans: Simple ArithmeticBy Henry Norris Russell on May 1, 1943AdvertisementABOUT THE AUTHOR(S)Recent Articles by Henry Norris RussellGalactic Gas CloudsAnthropocentrism's DemisePlanet Companions