The last work of his busy life was the revision of the Bay Psalm Book. Mr. Prince, in his account of this undertaking, gives an idea of the thoroughness of his preparatory work. He says: "The old Psalm Book,--the first book printed in all North America, or in the New World,--this version of 1640, by the clergymen, John Elliot, of Roxbury, Mr. Richard Mather, of Dorchester, and Mr. Thomas Weld,--was liked so much, that it was used by some congregations in England while I was there." "To gain sentiment," he says, for his own version, "I read every verse in English Bible and Polyglot; also in Hebrew, with Moulane's Interlineary, the Septuagint, the Chaldee, the ancient Latin, Latin versions of Syriac and Arabic, Castalio, Tremilius and Junius, Ainsworth and De Mies. When I met with difficulty I searched the following ancient lexicons: Avenarius, Schindler, Pagnini, Mercer, Buxtorfs two lexicons, namely, Hebrew and Chaldaic, Leigh, Castillus, Bythun, and Martin Albert." There were also various interpretations from another long list of names; while he looked into New England version for groundwork, he compared with twelve metrical versions. A contemporary says: "It showed his wonderful industry and remarkable scholarship." His professional labors throughout fifty years were very arduous, but he brought the same careful preparation into all branches of his daily occupations that we find in his published work. In addition to his theological studies, which were naturally absorbing, and his historical research, he was thoroughly conversant with polite literature. At his death his library, which he had deposited in the belfry of the Old South Church, said to be his study, remained there intact and undisturbed for seventeen years. The books were on shelves, the manuscripts and maps in boxes and barrels. At the breaking out of the Revolutionary war they were still left where Mr. Prince placed them, though the old meeting-house became the camping ground of British soldiery. Pews and pulpit were burnt, to enable the riding school--which the soldiers inaugurated--a better opportunity for its operations. Gov. Winthrop's old residence, next door to the church, opposite the foot of School street, which had been used some time as a parsonage, fell a victim to the lawlessness of the soldiers, who used the beams and rafters of this memento of the earliest Puritan days for firewood, while many of Mr. Prince's books and manuscripts were immolated on the same altar. It has been suggested that some were taken by the spectators who thronged to witness the exhibitions, as manuscripts known to have belonged to this library were found--so the catalogue states--as remote as in a grocer's shop in Nova Scotia. It would be difficult to conjecture which would have caused the greater grief to Mr. Prince,--the desecration of the church, whose construction had been a daily delight, and where he had earnestly labored for so many years, or the sacrifice