Letter, from Thomas Maclear to Sir John Herschel, dated at Spring Gardens Autograph letter signed by sender. Relates his experiences while visiting the Paris Observatory with G. B. Airy. Later travelled to Brussels to meet L. A. J. Quetelet. Is now preparing for a visit to Ireland and Mrs. Maclear will go to Bedfordshire. The meteorological observations [of the Cape] are to be printed in England under the direction of Robert FitzRoy. 24 August 1859