Note 299 — Chapter XIII · THE SOLAR CYCLE.
Reading edition
Mascari, Astroph. Journ. vol. ii. p. 119; Evershed, Astr. and Astroph. vol. xi. p. 426.
Reading edition
Mascari, Astroph. Journ. vol. ii. p. 119; Evershed, Astr. and Astroph. vol. xi. p. 426.