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Collingwood - Thanks WW for his two letters. He did not reply to the last because he did not think it would reach Dublin in time for the BAAS meeting: 'what you say is certainly very satisfactory'. [M. Perranet] called on his way to Paris and showed JH 'a pretty little reflector of [electrosilkened] glass which with about 4 in aperture and some 2 feet focus bore 200 very satisfactorily. It is not a thing to be pooh-poohed as the Dublin meeting seemed disposed to do'. JH is not surprised WW has been ill with the summer's heat, travelling and the BAAS meeting.