XX LIST OF ILLUSTRATIONS 



Fig. Page 



145. Choice heads of lettuce saved for the production of seed 404 



146. Double frames are sometimes used for forcing purposes 405 



147. Wooden mushroom houses at Kennett Square, Pa. 408 



148. A modern commercial mushroom range at Kennett 



Square, Pa. Built of concrete and tile. Frost proof 



and fire proof 409 



149. A New Jersey double duty house. Mushrooms are 



grown in the cellar, and plants and flowers in the 



greenhouse above 410 



150. Mushroom beds in a modern house 411 



151. Composting manure for the growing of mushrooms 412 



152. Drying bricks of mushroom spawn 415 



153. A good crop of mushrooms 418 



154. A morning's picking. Note variation in size 421 



155. Baskets of mushrooms packed ready for the covers____ 422 



156. A wagonload of mushrooms en route to the shipping 



station 423 



