Letter, from James Hudson to Sir John Herschel, dated at Royal Society Autograph letter signed by sender. Has now completed his examination of the mode of reading off the barometer of J. W. G. Bu[t]zengeiger, made under the direction of H. C. Schumacher. Comments on the readings. Has now sent off all the Italian papers. Hopes John Frederick William Herschel will have a prosperous voyage. 6 November 1833