1. report on the Kew observations;Chree's,1915
2. Regarding this spot, Dennett, F. C., , reports in the October, 1914, , issue of Knowledge (p. 379 ) as follows: “No. 24.—A Fine spot, first seen on August 13, 1914, within the northeastern limb, followed by a faculic area. From August 16–22 some small pores clustered round its eastern half; none, however, were very persistent. There were also some penumbral esxtensions, which, on August 21, reached a maximum diameter of 36,000 miles; On August 18, the umbra was almost broken into three by very pale bridges. A bright tongue projected into it form the east, August 19–21. The northern part of the umbra was quite cut off on August 23–25. The spot was last seen on August 26. . . . During the eclipse on August 21, No. 24 was a beautiful object. Its dark umbra was, however, markedly less dark than the advancing rugged limb of the Moon, which presently covered it. It was of large size, but the spectroscope showed comparatively little disturbance.”
3. See, for example, Bauer', L. A., , articles in Terr. Mag., , vol. 5, , 1900, , pp. 143– -165 , and vol. 7, 1902, pp. 155–192.