'This instance has strongly confirmed me in an opinion which I have long held--that no independent division is comparable in general accuracy to engine-division,--where the fundamental divisions of the engine have been made by Troughton's method, and where in any case the determination by the astronomer of errors of a few divisions will suffice, in consequence of the uniformity of law of error, to give the errors of the intermediate divisions.'--The method of observing with the Altazimuth is carefully described, and the effect of it, in increasing the number of observations of the Moon, is thus given for the thirteen lunations between 1847, May 15, and 1848, May 30. 'Number of days of complete observations with the Meridional Instruments, 111; number of days of complete observations with Altitude and Azimuth Instrument, 203. The results of the observations appear very good; perhaps a little, and but a little, inferior to those of the Meridional Instruments. I consider that the object for which this instrument was erected is successfully attained.'--Being satisfied with the general efficiency of the system arranged by Mr Brooke for our photographic records (of magnetical observations) I wrote to the Admiralty in his favour, and on Aug. 25th the Admiralty ordered the payment of _£500_ to him. A Committee of the Royal Society also recommended a reward of _£250_ to Mr Ronalds, which I believe was paid to him.--On May 1st the last revise of the Lunar Reductions was passed, and on May 5th, 500 copies were sent for binding.--In this year Schumacher and I refused a medal to Miss Mitchell for a Comet discovered, because the rules of correspondence had not been strictly followed: the King of Denmark gave one by special favour.--In this year occurred the discovery of Saturn's 8th Satellite by Mr Lassell: upon which I have various correspondence.--On the 18th of December the degree of LL.D. was conferred upon me by the University of Edinburgh.--The Ipswich Lectures: A wish had been expressed that I would give a series of Astronomical Lectures to the people of Ipswich. I therefore arranged with great care the necessary apparatus, and lectured six evenings in a room (I forget its name--it might be Temperance Hall--high above St Matthew's Street), from Mar. 13th to the end of the week. A shorthand writer took them down: and these formed the 'Ipswich Lectures,' which were afterwards published by the Ipswich Museum (for whose benefit the lectures were given) and by myself, in several editions, and afterwards by Messrs Macmillan in repeated editions under the title of 'Airy's Popular Astronomy.'--It had been found necessary to include under one body all the unconnected Commissions of Sewers for the Metropolis, and Lord Morpeth requested me to be a member. Its operations began on Oct. 28th. In constitution it was the most foolish that I ever knew: consisting of, I think, some 200 persons, who could not possibly attend to it. It came to an end in the next year."