Letter, from Thomas Maclear to Sir John Herschel, dated at Royal Observatory Autograph letter signed by sender. Returns the hourly observations of the last equinox. There will be a meeting of the Institute tomorrow. Has removed the silver lines from the mural circle and replaced them by Bermuda cobwebs. Would like to insert these in John Frederick William Herschel's micrometer. Has been busy calculating a large table of precessions in R.A. Capt. Alexander should desist from newspaper writing. 5 April 1836