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Asks GA many questions about his magnetical explanation [see GA's 1861-4-22].
Encourages GA to develop some experiments to study the electrical phenomenon [see GA's 1861-9-23] more carefully.
Reminds JH that the algebraic formulation of the theory of the achromatic telescope eyepiece was formulated by GA.
Recognizes the validity of GA's claim to the eyepiece theory [see GA's 1861-3-27]; JH did not have space to deal adequately with the subject of telescopes.