CHAPTER X.

SUN-SPOTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Old theories--Degrees of spot-shadow overestimated--What spots are not, and what they are--They are caused by magnetic perturbations--Inconsistency of accepted theories--Figures that are deceptive--Effects of these wonderful phenomena--Mistaken conceptions--May not be tabulated--Unbiassed estimate of their character and location.