This book contains a comprehensive guide to the successful growing of mushrooms in a commercial paradigm, with a special focus on spawn-making and the care of running spawn. Containing a plethora of wonderfully detailed illustrations and photographs, and written in a wonderfully accessible manner, this handbook is the perfect text for those looking to begin a commercial mushroom-growing enterprise and constitutes a great addition to any collection of antiquarian mycological literature. Chapters contained herein include: Pure-Culture Spawn, Preparation of the Beds-filling, Spawning and Casing, Spawn and the Care of the Running Spawn, Supervising the Spawn Run, and Mushroom Spawn-making. This book has been elected for modern republication due to its immense educational value, and is proudly republished here complete with a new introduction to the subject.