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Sending a descriptive pamphlet of an optical invention of his own for simple experiments with color.
Outlining his geometrical laws for the Great Pyramid.
Pointing out an error by JH in assigning the authorship of a weather table to Sir William Herschel.
The writer of the enclosed production has given lectures at SN's establishment. Introduces him to JH. Hopes to give a lecture at Hawkhurst. Would be pleased for any of the Herschel family to view the orchid house, now in full bloom.