Sun’s heat, age of, according to Thomson and Tait, [35]

„ age of, as determined by Biology, [64]

„ age of, as determined by Geology, [39]

Tait, Prof., nebulæ with solid matter in a gaseous mass, [20]

„ on age of sun’s heat, [35]

Temperature excessive, essential to nebulæ, [26]

„ produced by collision, [5]

Thomson, Sir W., on age of sun’s heat, [35]

„ on meteorites, [12]

„ on origin of solar nebula, [28]