the last quarter of this year I was engaged in a series of calculations of chronological eclipses. On Sept. 30th Mr Bosanquet wrote to me about the Eclipse of Thales, and I urged on the computations related to it, through Mr Breen. In October the eclipse of Agathocles (the critical eclipse for the motion of the Moon's node) was going on. In October Hansteen referred me to the darkness at Stiklastad.--I went to Sweden to observe the total eclipse of July 28th, having received assistance from the Admiralty for the journeys of myself, Mr Dunkin, Mr Humphreys and his friend, and Capt. Blackwood. I had prepared a map of its track, in which an important error of the _Berliner Jahrbuch_ (arising from neglect of the earth's oblateness) was corrected. I gave a lecture at the Royal Institution, in preparation for the eclipse, and drew up suggestions for observations, and I prepared a scheme of observations for Greenwich, but the weather was bad. The official account of the Observations of the Eclipse, with diagrams and conclusions, is given in full in a paper published in the Royal Astr. Society's Memoirs.--This year I was President of the British Association, at the Ipswich Meeting: it necessarily produced a great deal of business. I lectured one evening on the coming eclipse. Prince Albert was present, as guest of Sir William Middleton: I was engaged to meet him at dinner, but when I found that the dinner day was one of the principal soirée days, I broke off the engagement.--On May 26th I had the first letter from E. Hamilton (whom I had known at Cambridge) regarding the selection of professors for the University of Sydney. Herschel, Maldon, and H. Denison were named as my coadjutors. Plenty of work was done, but it was not finished till 1852.--In connection with the clock for Westminster Palace, in February there were considerations about providing other clocks for the various buildings; and this probably was one reason for my examining Shepherd's Clocks at the Great Exhibition and at Pawson's. In November I first proposed that Mr E.B. Denison should be associated with me. About the end of the year, the plan of the tower was supplied to me, with reference to the suspension of the weights and other particulars.--In 1850 Admiral Dundas (M.P. for Greenwich and one of the Board of Admiralty) had requested me to aid the Trustees of the Dee Navigation against an attack; and on Mar. 19th 1851 I went to Chester to see the state of the river. On Jan. 1st 1852 I went to give evidence at the Official Enquiry.--At a discussion on the construction of the Great Exhibition building in the Institution of Civil Engineers, I expressed myself strongly on the faulty principles of its construction.--In this year I wrote my first Paper on the landing of Julius Caesar in Britain, and was engaged in investigations of the geography, tides, sands, &c., relating to the subject."