Crookes, chemical elements, [210]
Crova, solar constant, [225]
Cruls, comet of 1882 [358] [364]
Cusa, solar constitution,[ 57]
Cysatus, Orion nebula,[ 21];
comet of 1618 [362]
Damoiseau, theory of Halley's comet, [101]
D'Arrest, orbits of minor planets, [285];
Andromede meteors, [334]
ages of stars, [375]
variable nebulæ, [403]
measures of nebulæ, [404]
Darwin, G. H., rigidity of the earth, [258];
Saturn's ring system, [301]
origin of the moon, [316]-318
development of solar system, [318] [319] [322]
solar tidal friction, [319]
Daubrée, falls of aerolites, [339]
Davidson, satellite-transit on Jupiter, [292]