A further interruption came from the purchase of a house on Beacon Street and the necessity of arranging to leave the old mansion on Bedford Street. The new house was a fine one, overlooking the Mall and the Common; and the new library, which was planned especially for Prescott's needs, was much more commodious than the old one. But the confusion and feeling of unsettlement attendant on the change distracted Prescott more than it would have done a man less habituated to a self-imposed routine. "A month of pandemonium," he wrote; "an unfurnished house coming to order; a library without books; books without time to open them." It took Prescott quite a while to resume his methodical habits. His old-time indolence settled down upon him, and it was some time before his literary momentum had been recovered. Moreover, he presumed upon the fairly satisfactory condition of his eye and used it to excess. The result was that his optic nerve was badly over-taxed, "probably by manuscript digging," as he said. The strain was one from which his eye never fully recovered; and from this time until the completion of the Peru, he could use it in reading for only a few minutes every day, sometimes perhaps for ten or fifteen, but never for more than thirty. As this is the last time that we shall mention this subject, it may be said that for all purposes of literary work Prescott was soon afterward reduced to the position of one who was actually blind. What had before been a merely stationary dimness of vision became a slowly progressive decay of sight, or, to express it in medical language, amblyopia had passed into amaurosis. He followed rigorously his oculist's injunctions, but in the end he had to face the facts unflinchingly; and a little later he recorded his determination to give up all use of the eye for the future in his studies, and to be contented with preserving it for the ordinary purposes of life. The necessity disheartened him. "It takes the strength out of me," he said. Nevertheless, neither this nor the fact that his general health was most unsatisfactory, caused him to abandon work. He could not bring himself to use what he called "the coward's word, 'impossible.'" And so, after a little time, he went on as before, studying "by ear-work," and turning off upon his noctograph from ten to fifteen pages every day. He continued also his outdoor exercise, and, in fact, one of the best-written chapters of the Conquest of Peru—the last one—was composed while galloping through the woods at Pepperell. On November 7, 1846, the Conquest of Peru was finished. Like the preceding history, it was published by the Harper Brothers, who agreed to pay the author one dollar per copy and to bring out a first edition of seventy-five hundred copies. This, Mr. Ticknor says, was a more liberal arrangement than had ever before been made with an historical writer in the United States. The English copyright was purchased by Bentley for £800.

Prescott's main anxiety about the reception which would be given to the Conquest of Peru was based upon his doubts as to its literary style. Neither of his other books had been written so rapidly, and he feared that he might incur the charge of over-fluency or even slovenliness. Yet, as a matter of fact, the chorus of praise which greeted the two volumes was as loud and as spontaneous as it had been over his Mexico. Prescott now stood so firmly on his feet as to look at much of this praise in a somewhat humorous light. The approbation of the Edinburgh Review no longer seemed to him the summa laus, though he valued it more highly than the praise given him by American periodicals, of which he wrote very shrewdly:

"I don't know how it is, but our critics, though not pedantic, have not the businesslike air, or the air of the man of the world, which gives manliness and significance to criticism. Their satire, when they attempt it—which cannot be often laid to their door—has neither the fine edge of the Edinburgh nor the sledgehammer stroke of the Quarterly. They twaddle out their humour as if they were afraid of its biting too hard, or else they deliver axioms with a sort of smart, dapper conceit, like a little parson laying down the law to his little people.... In England there is a far greater number of men highly cultivated—whether in public life or men of leisure—whose intimacy with affairs and with society, as well as books, affords supplies of a high order for periodical criticism."

As for newspaper eulogies, he remarked: "I am certainly the cause of some wit and much folly in others." His latest work, however, brought him two new honours which he greatly prized,—an election to the Royal English Society of Literature, and the other an invitation to membership in the Royal Society of Antiquaries. The former honour he shared with only one of his fellow-countrymen, Bancroft; the latter had heretofore been given to no American.

Prescott now indulged himself with a long period of "literary loafing," as he described it, broken in upon only by the preparation of a short memoir of John Pickering, the antiquarian and scholar, who had been one of Prescott's most devoted friends. This memoir was undertaken at the request of the Massachusetts Historical Society. It has no general interest now, but is worthy of note as having been the only one of Prescott's works which he dictated to an amanuensis. Prescott had an aversion to writing in this way, although he had before him the example of his blind contemporary, Thierry. Like Alphonse Daudet, he seems to have felt that what is written by hand comes more directly from the author's inner self, and that it represents most truly the tints and half-tones of his personality. That this is only a fancy is seen clearly enough from several striking instances which the history of literature records. Scott dictated to Lockhart the whole of The Bride of Lammermoor. Thackeray dictated a good part of The Newcomes and all of Pendennis, and even Henry Esmond, of which the artificial style might well have made dictation difficult. Prescott, however, had his own opinion on the subject, and, with the single exception which has just been cited, he used his noctograph for composition down to the very end, dictating only his correspondence to his secretary.

His days of "literary loafing" allowed him to enjoy the pleasures of friendship which during his periods of work were necessarily, to some extent, intermitted. No man ever had more cordially devoted friends than Prescott. He knew every one who was worth knowing, and every one was attracted by the spontaneous charm of his manner and his invincible kindliness. Never was a man more free from petulance or peevishness, though these defects at times might well have been excused in one whose health was such as his. He presented the anomaly of a dyspeptic who was still an optimist and always amiable. Mr. John Foster Kirk, who was one of his secretaries, wrote of him:—

"No annoyance, great or small, the most painful illness or the most intolerable bore, could disturb his equanimity, or render him in the least degree sullen, or fretful, or discourteous. He was always gay, good-humoured, and manly. He carried his kindness of disposition not only into his public, but into his private, writings. In the hundreds of letters, many of them of the most confidential character, treating freely of other authors and of a great variety of persons, which I wrote at his dictation, not a single unkind or harsh or sneering expression occurs. He was totally free from the jealousy and envy so common among authors, and was always eager in conversation, as in print, to point out the merits of the great contemporary historians whom many men in his position would have looked upon as rivals to be dreaded if not detested."

Bancroft the historian has added his testimony to the greatness of Prescott's personal charm.

"His countenance had something that brought to mind the 'beautiful disdain' that hovers on that of the Apollo. But while he was high-spirited, he was tender and gentle and humane. His voice was like music and one could never hear enough of it. His cheerfulness reached and animated all about him. He could indulge in playfulness and could also speak earnestly and profoundly; but he knew not how to be ungracious or pedantic."