Withorwithouttheaccompanimentofthathypothesisofnebularcondensation
whenceitnaturallyfollows，thedoctrinethattheSunisgraduallylosing
hisheat，hasnowgainedgeneralacceptance;andcalculationshavebeenmade，
bothrespectingtheamountofheatandlightalreadyradiated，ascompared
withtheamountthatremains，andrespectingtheperiodduringwhichactive