A catalogue of Mr. Boydell's, collection of drawings, in gold frames and plate glass, prints framed and books of prints, which will be sold by auction, by Mr. Christie, At his Great Room in Pall-Mall, on Monday, April 22, 1771, and the foling Day. To be viewed till the Time of Sale, which will begin at twelve O'Clock each day. Catalogues may be had as above. N. B. The Prints, after some of the following Drawings, being not quite finished, they will be delivered to the Purchasers at the time mentioned opposite each Drawing, half to be paid down and the remainder on the delivery [electronic resource].