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[Note.—These observations contain the record of the commencement of the absolute magnetic determinations at the Coimbra Observatory, with instruments procured by M. de Souza at Kew, and on the system of observation and reduction adopted at the Kew Observatory. The employment of the photographic continuously self-recording instruments at Coimbra has hitherto been delayed by the works required for the introduction of gas into the Observatory; but this has now been accomplished; and a letter, dated April 20, 1867, from the Director states that the photographic records were at that date on the point of commencing. The latitude and longitude of the Observatory are 40° 12'·5 N., and 8° 25'W.—E. S.]

IV. Monthly magnetic determinations, from June to November 1866 inclusive, made at the observatory at Coimbra