Editorial note — Chapter IX · CONTINUED. (continued 2)
Reading edition
[Footnote 35: This, it must be noticed, was in the year 1599. The variation alters progressively, increasing to a maximum in one deflexion; it then retrogrades till it points true north, which it progressively overpasses in the opposite deflexion to a maximum again. But these changes do not proceed with sufficient regularity to admit of being predicted with any certainty.--E.]