Copy letter, from Sir John Herschel to Friedrich Wilhelm Bessel, dated at Feldhausen Copy letter in John Herschel's hand. Friedrich Wilhelm Bessel's letter of 4 July 1834 reached John Frederick William Herschel in March 1835. Discusses the observability of the sixth and seventh Saturnian satellites. Meteorological observations at sea, at Cape, and from Calcutta lead John Frederick William Herschel to suspect 'annual transfer of atmospheric pressure' between hemispheres and permanent depression at equator. Describes John Frederick William Herschel's work at the Cape. Praises Thomas Maclear. 16 May 1835