For ten years we have been trying, and trying in vain, both in England and America, to obtain a copy of Kirby's descriptions of the insects of the Northern parts of British America, contained in the fourth volume of Richardson's Fauna Boreali-Americana, published at Norwich in 1837. Many of our friends have been making similar attempts, and always with the like ill-success. We have had, however, occasional access to a copy in the iibrary of the University of Toronto, which, with the exception of one in the Library of Parliament at Ottawa, is the only copy we know of in Canada.