By an accident I did not receive your letter till this evening. I would that you had added to the account of your indisposition the probable causes of it. It has left me anxious whether or no you have not exposed yourself to unwholesome influences in your chemical pursuits. There are "few" beings both of hope and performance, but few who combine the "are" and the "will be." For God's sake, therefore, my dear fellow, do not rip open the bird that lays the golden eggs. I have not received your book. I read yesterday a sort of medical review about it. I suppose Longman will send it to me when he sends down the "Lyrical Ballads" to Wordsworth. I am solicitous to read the latter part. Did there appear to you any remote analogy between the case I translated from the German Magazine and the effects produced by your gas? Did Carlisle[1] ever communicate to you, or has he in any way published his facts concerning "pain", which he mentioned when we were with him? It is a subject which "exceedingly interests" me. I want to read something by somebody expressly on "pain", if only to give an "arrangement" to my own thoughts, though if it were well treated, I have little doubt it would revolutionize them. For the last month I have been trembling on through sands and swamps of evil and bodily grievance. My eyes have been inflamed to a degree that rendered reading and writing scarcely possible; and strange as it seems, the act of metre composition, as I lay in bed, perceptibly affected them, and my voluntary ideas were every minute passing, more or less transformed into vivid spectra. I had leeches repeatedly applied to my temples, and a blister behind my ear--and my eyes are now my own, but in the place where the blister was, six small but excruciating boils have appeared, and harass me almost beyond endurance. In the meantime my darling Hartley has been taken with a stomach illness, which has ended in the yellow jaundice; and this greatly alarms me. So much for the doleful! Amid all these changes, and humiliations, and fears, the sense of the Eternal abides in me, and preserves unsubdued my cheerful faith, that all I endure is full of blessings! At times, indeed, I would fain be somewhat of a more tangible utility than I am; but so I suppose it is with all of us--one while cheerful, stirring, feeling in resistance nothing but a joy and a stimulus; another while drowsy, self-distrusting, prone to rest, loathing our own self-promises, withering our own hopes--our hopes, the vitality and cohesion of our being! I purpose to have 'Christabel' published by itself--this I publish with confidence--but my travels in Germany come from me now with mortal pangs. Nothing but the most pressing necessity could have induced me--and even now I hesitate and tremble. Be so good as to have all that is printed of 'Christabel' sent to me per post.