It was good of JH to reply so fully to his letter. Now has a better understanding of the subject than before. Read a paper on the geology of the Lake District at the local Philosophical Society. Comments on his own theories of rock foundations.

Invites ES and his wife [at St. Leonard's] to visit . JH is impressed with ES's ability to develop a working plan for terrestrial magnetism observations. Is prepared to write a review article [about magnetism?] if invited, but JH refuses to write such articles and offer them 'for acceptance or rejection.'