Radiant Point of Meteor Shower, 308.
Railway to Alpha Centauri, 338.
Rank of Earth in Space, 329.
Reappearance of Halley’s Comet, 267.
Recorder, Sunshine, 5.
Reflectors for Lighthouses, 271.
Refraction of Light through Prism, 351.
Relative Sizes of Earth and Sun, 31.
Requisites for Astronomical Discoveries, 199.
Resistance of Air, 182.
Retrograde Motion of Mars, 162.
Rhea, Distance and Period of, 392.
Rifle, 68.
Rigel, 388.
Ring Nebula in Lyra, 354.
Rings of Saturn, 224.
Rings of Smoke, 357.
Rising and Setting of Sun, Ancient Theories of, 48.
Roberts, Mr. Isaac, 325;
His Photograph of Great Andromeda Nebula 364.
Rotating Globe of Oil, 215.
Rotation of Earth, 49.
Rotation of Earth, Illustration of, 53.
Rotation of Jupiter, 215.
” ” Mars, 192.
” ” Sun, 39.
Rowton Meteorite, 313.
Royal Canal Fly-boats, 52.
Royal Institution, 53.