In Plate III, Fig. 1 represents an immature plant; Fig. 2, cap expanding with growth; Fig. 3, cap further expanded and slightly umbonate; Fig. 4, mature specimen, cap plane or fully expanded, margin irregular and smooth, stem equal, smooth and ringless; Fig. 5, section showing gills broad, free, ventricose, unequal, and flesh white; Fig. 6, spores white. APPENDIX A. PRESERVING AND COOKING MUSHROOMS. In Europe several species of mushrooms are preserved by boiling and afterwards placing them in earthern jars or tubs filled with water, which is renewed from time to time. This simple and economical method of keeping mushrooms affords the people considerable provision. With regard to the preparation of fresh mushrooms for table use, Dr. Roques, an eminent writer on fungi, gives the following excellent suggestions: "After selecting good mushrooms, remove the skin or epidermis, cutting away the gills, and in some cases the stem, which is usually of not so fine a texture. "It is important to collect for use only young and well-preserved specimens, because a mushroom of excellent quality may, nevertheless, when overmature or near its decline, become dangerous for food. It then acts as does every other food substance which incipient decomposition has rendered acrid, irritating and indigestible. It is, moreover, rarely the case that mushrooms in their decline are not changed by the presence of larvae." In Geneva a very lucrative trade is carried on in the exportation of the "_Edible Boletus_," which is preserved for use in various ways, the simplest of which consists in cutting the caps in slices and stringing them, after which they are placed on hurdles in the shade to dry. They may also be dried in a stove or oven, but the former method is preferable, as the mushroom then retains more of its flavor or perfume. When the slices are perfectly dried they are put into sacks and suspended in a dry, airy place. Sometimes before the mushrooms are sliced they are plunged into boiling water for an instant, which treatment is said to preserve them from the ravages of insects. Several kinds of mushrooms are preserved in the following manner: After they have been properly washed and cleansed, they are boiled in salted water and afterwards wiped dry. They are then placed in layers, in jars, sprinkled with salt and pepper, and covered with pure olive oil or vinegar. _Lactarius deliciosus_, _Cantharellus cibarius_, _Morchellas_, _Clavarias_, etc., are thus preserved. Before using the dried mushrooms they are soaked in tepid water for some time and afterwards prepared as if fresh, with the usual seasoning. RECEIPTS.