Under these circumstances I feel it would be highly imprudent, and perhaps fatal, for me to return and to attempt to perform the official duties of President of the Royal Society; and as I had no other feeling for that high and honourable situation except the hope of being useful to the society, so I would not keep it a moment without the security of being able to devote myself to the labour and attention it demands. I beg, therefore, you will be so good as to communicate my resignation to the council and to the Society at their first meeting in November, stating the circumstances of my severe and long-continued illness as the cause. At the same time I beg you will express to them how grateful I feel for the high honour they have done me in placing me in the chair for so many successive years. Assure them that I shall always take the same interest in the progress of the grand objects of the Society, and throughout the whole of my life endeavour to contribute to their advancement and to the prosperity of the body. He continued his notes thus: ‘_September 2._--I took my exercise well with less fatigue, and certainly feel better. Offered up my thanksgiving to the O. O. O. with tears of gratitude and feelings of intense adoration, ‘_September 27_, ST. GOAR.--A very beautiful and glorious evening. I thought I was going to be quite well, as the weakness of the left wrist, which put an end to my shooting at Spiers, is quite gone; but I found my stiff leg as bad as ever. Yet I can hardly be lower or live lower. Dubito fortissime restaurationem meam. ‘As I have so often alluded to the possibility of my dying suddenly, I think it right to mention that I am too intense a believer in the Supreme Intelligence, and have too strong a faith in the optimism of the system of the universe, ever to accelerate my dissolution. The laurel-water and laudanum and opium that are in my dressing-case are medicines. I have been and am taking a care of my health which I fear it is not worth, but which, hoping it may please Providence to preserve me for wise purposes, I think my duty. G. O. O. O.’ He arrived in London on October 6. Not finding his health improve, on March 29, 1828, he left England again. Before he went he sent a paper on Volcanoes to the Royal Society.