that all your endearing qualities will now be employed to promote the happiness of one whom we think so worthy of them as your dear husband, who has left us in the best opinion of his good heart, as well as his enlightened and sound understanding.  His late stay with us has endeared him to us all.  Never did man enter into the married state from more honourable motives, or from a heart more truly seeking the genuine happiness of that state than Mr Airy, and he will, I trust, find his reward in you from all that a good wife can render to the best of husbands, and his happiness be reflected on yourself.”  It would be difficult to find letters of more genuine feeling and satisfaction, or more eloquently expressed, than these.

The narrative of the Autobiography will now be resumed.

“I had been disappointed two years before of an expedition to Derbyshire.  I had wished still to make it, and my brother wished to go:  and we determined to make it this year (1824).  We were prepared with walking dresses and knapsacks.  I had well considered every detail of our route, and was well provided with letters of introduction, including one to the Rev. R. Smith of Edensor.  On June 29th we started by coach to Newmarket and walked through the Fens by Ramsay to Peterborough.  Then by Stamford and Ketton quarries to Leicester and Derby.  Here we were recognized by a Mr Calvert, who had seen me take my degree, and he invited us to breakfast, and employed himself in shewing us several manufactories, &c. to which we had been denied access when presenting ourselves unsupported.  We then went to Belper with an introduction from Mr Calvert to Jedediah Strutt:  saw the great cotton mills, and in the evening walked to Matlock.  Up to this time the country of greatest interest was the region of the fens about Ramsay (a most remarkable district), but now began beauty of scenery.  On July 9th we walked by Rowsley and Haddon Hall over the hills to Edensor, where we stayed till the 12th with Mr Smith.  We next visited Hathersage, Castleton, and Marple (where I wished to see the canal aqueduct), and went by coach to Manchester, and afterwards to Liverpool.  Here Dr Traill recommended us to see the Pontycyssylte Aqueduct, and we went by Chester and Wrexham to Rhuabon, saw the magnificent work, and proceeded to Llangollen.  Thence by Chester and Northwich (where we descended a salt-mine) to Macclesfield.  Then to the Ecton mine (of which we saw but little) through Dovedale to Ashbourn, and by coach to Derby.  On July 24th to Birmingham, where we found Mr Guest, lodged in his house, and were joined by my pupil Guest.  Here we were fully employed in visiting the manufactures, and then went into the iron country, where I descended a pit in the Staffordshire Main.  Thence by coach to Cambridge, where I stopped to prepare for the Fellowship Examination.

“I had two pupils in this portion of the Long Vacation, Turner and Dobbs.  On August 2nd my writing of Latin began regularly as before.  My principal mathematics on the quires are Optics.  On August 25th I made experiments on my left eye, with good measures, and on Aug. 26th ordered a cylindrical lens of Peters, a silversmith in the town, which I believe was never made.  Subsequently, while at Playford, I ordered cylindrical lenses of an artist named Fuller, living at Ipswich, and these were completed in November, 1824.