, and Dr. Calder. Dr. John Calder, a native of Aberdeen, bred to the dissenting ministry, was for some time keeper of Dr. Williams's Library in Redcross Street. He was a candidate for the office given to Dr. Abraham Rees, of editor and general super-intendent of the new issue of
Chambers's Cyclopædia
, undertaken by the booksellers in 1776, and he supplied to it some new articles. The Duke of Northumberland warmly patronized Dr. Calder, and made him his companion in London and at Alnwick Castle as Private Literary Secretary. Dr. Thomas Percy, who had constituted himself cousin and retainer to the Percy of Northumberland, obtained his bishopric of Dromore in 1782, in the following year lost his only son, and suffered from that failure in eyesight, which resulted in a total blindness.
Having become intimately acquainted with Dr. Calder when at Northumberland House and Alnwick, Percy intrusted to him the notes he had collected for illustrating the
Tatler
,
Spectator
, and
Guardian
. These were after-wards used, with additions by Dr. Calder, in the various editions of those works, especially in the six-volume edition of the