Rosse, third Earl of, biographical sketch, [114];
great specula, [115]-117
discovery of spiral nebulæ, [118]
resolution of nebulæ, [119]
climate and telescopes, [434]
Rosse, fourth Earl of, experiments on lunar heat, [269]
Rost, nature of sun-spots,[ 54]
Roszel, mass of asteroids, [287]
Rowland, photographic maps of solar spectrum, [210] [440];
elements in run, [213]
concave gratings, [439] [440]
Rümker, observation of Encke's comet,[ 90]
Russell, H. C., red spot on Jupiter, [295];
change in Argo nebula, [404]
photographs of Nubeculæ, [425]
[Pg 485] photographs of Nubeculæ, [425]
Russell, H. N., atmosphere of Venus, [254]
Rutherfurd, lunar photography, [268];
star spectra, [372]
photographs of the Pleiades, [410]
diffraction gratings, [439]