His contemporary political influence is borne witness to in a letter from Lord Bateman, dated 3 November 1798. "The Opposition", he writes to Gillray, "are as low as we can wish them. You have been of infinite service in lowering them, and making them ridiculous." Gillray's extraordinary industry may be inferred from the fact that nearly 1000 caricatures have been attributed to him; while some consider him the author of as many as 1600 or 1700. According to the "Encyclopædia Britannica" Eleventh Edition, "Gillray is as invaluable to the student of English manners as to the political student, attacking the social follies of the time with scathing satire; and nothing escapes his notice, not even a trifling change of fashion in dress. The great tact Gillray displays in hitting on the ludicrous side of any subject is only equalled by the exquisite finish of his sketches—the finest of which reach an epic grandeur and Miltonic sublimity of conception."