Though I was encouraged by the sensible progress of my work, it was necessarily slow. But in time the tendency to inflammation diminished, and the strength of the eye was confirmed more and more. It was at length so far restored, that I could read for several hours of the day, though my labors in this way necessarily terminated with the daylight. Nor could I ever dispense with the services of a secretary, or with the writing-case, for, contrary to the usual experience, I have found writing a severer trial to the eye than reading, - a remark, however, which does not apply to the reading of manuscript; and to enable myself, therefore, to revise my composition more carefully, I caused a copy of the "History of Ferdinand and Isabella" to be printed for of my own inspection, before it was sent to the press for the publication. Such as I have described the preparation of the "Conquest of Mexico"; and, satisfied with being raised so nearly to a level with the rest of my species, I scarcely envied the superior good fortune of those who could prolong their studies into the evening, and the later hours of the night. But a change has again taken place during the last two years. The sight of my eye has become gradually dimmed, while the sensibility of the nerve has been so far increased, that for several weeks of the last year I have not opened a volume, and through the whole time I have not had the use of it, on an average, for more than an hour a day. Nor can I cheer myself with the delusive expectation, that, impaired as the organ has become, from having been tasked, probably, beyond its strength, it can ever renew its youth, or be of much service to me hereafter in my literary researches. Whether I shall have the heart to enter, as I had proposed, on a new and more extensive field of historical labor, with these impediments, I cannot say. Perhaps long habit, and a natural desire to follow up the career which I have so long pursued, may make this, in a manner, necessary, as my past experience has already proved that it is practicable.