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Continues opposed to application to government to support the 'Great Southern Reflector' [see JH's 1849-10-27]; responds to a number of specific queries about the construction of such a telescope.
Thanks for several papers; JH describes article on telescopes he has prepared for the Encyclopaedia Britannica.
Congratulates TR on his volume of astronomical observations. Skeptical about alleged changes in Orion nebula. Feels better telescopes and drawings would be needed to confirm this. Discusses own double star observations.
Introduces Edward Cooper, who has second largest telescope in the world [after JH]. Asks JH to assist Cooper. Discusses various astronomical issues and instruments.