David Bertie wrote a unique informative article called "The Thinking Trumpeter's Guide To Saint-Jacome's Grand Method For Cornet" that was published in the March 2022 (pp. 52-58) issue of the International Trumpet Guild Journal. Subscribe to the ITG and read that article which contains a brief overview that is part of an upcoming revision of the the Saint-Jacome Method that will be more accessible and practical to see all the depth of wisdom in this essential method book. This book will soon be published by Charles Colin and available in hard copy and also available as a download at qPress
This article also includes a two page etude to see what awaits the aspiring player.