Plate 6. (September 7, 1871.) An auroral arc, with streamers and dark clouds, and maintaining a bright appearance though in proximity to the moon. (May 8, 1871.) A double-arched auroral arc (the arches are longitudinally arranged). [Sidenote: April 28, 1871, multiple arc. Oct. 25, 1870, coloured Aurora.] Plate 7. (April 28, 1871.) A multiple-arched arc of Aurora with moonlight. (October 25, 1870.) A case of grandest coloured Auroræ, or Aurora superb and almost universal. All the foregoing drawings are very vivid and striking, and form a most interesting set of typical forms of Auroræ. According to my own experience, the Aurora with arches arranged longitudinally, thus, [Illustration], is the rarest of all the forms. I have not met with it myself, nor do I recollect an illustration of one other than Prof. Smyth’s. CHAPTER IV. PHENOMENA SIMULATING AURORÆ. _Auroric Lights (Kinahan)._ [Sidenote: Mr. Kinahan’s Auroric Lights. White and red. White light appears in pencils radiating from a point.] Mr. G. Henry Kinahan writes to ‘Nature,’ from Ovoca, under date January 27th, 1877, and speaks of two distinct kinds of light so classed—one brilliant and transparent, of a white yellowish-blue or yellowish-red colour, while the other is semi-opaque and of a bloody red colour, the latter being considered in Ireland a forerunner of bad weather. The first kind generally appears as intermittent pencils of light that suddenly appear and disappear. [Sidenote: Frequently not stationary, but jumping about.] Usually they proceed or radiate from some point near the north of the horizon; but Mr. Kinahan has frequently seen them break from a point in the heavens, not stationary, but jumping about within certain limits. Sometimes these lights occur as suddenly flashing clouds of light of a white colour, but at other times of blue and reddish yellow. [Sidenote: In daylight like sun-rays. Red light appears in clouds floating upwards or diffused.] If this class of lights is watched into daylight, they appear somewhat like faint rays of a rising sun. One morning, while travelling in West Galway in the twilight, they were very brilliant, and quite frightened Mr. Kinahan’s car-driver, who thought the sun was going to rise in the north instead of the east. The second, or bloody red light, usually occurs in clouds floating in one direction up into the heavens, but often diffused over a portion of the sky. Mr. Kinahan has never seen them coming from the east, and on only a few occasions from the south, but generally from the west, north-west, or north. [Sidenote: Red light appears as dirty misty clouds in daylight, or as a mist or misty rays.]