Cantor Lectures On The Modern Methods Of Artificial Illumination : Delivered Before The Royal Society Of Arts On February 15, 22, And March 1 And 8, 1909, By LEON GASTER.. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.