SCIENTIFIC AMERICAN, New York, June 21, 1902  This issue contains the following prints, articles, and/or ads: The listing for the patent #701,839 for the window envelop; The Ruins of St. Pierre; The Development of the Sault Ste. Marie Canal; Silkworm Culture in America; Extraordinary Trench Digging; The Elliott book-Typewriter; and other articles and advertisements. This is a full issue and in good condition. See photos for full details.