One of the best of the edible species of _Lactarius_, known as _Lactarius deliciosus_, changes, wherever cut or bruised, to a dull livid green. This fungus is filled with an orange milky fluid, which becomes green on exposure to the air, and it is consequently the juice which oxidizes on exposure. Some varieties more than others of the cultivated mushroom become brownish on being cut, and a similar change we have observed, though not recorded, in other species. The presence of a milky juice in certain fungi has been alluded to. This is by no means confined to the genus _Lactarius_, in which such juice is universal, sometimes white, sometimes yellow, and sometimes colourless. In Agarics, especially in the subgenus _Mycena_, the gills and stem are replete with a milky juice. Also in some species of _Peziza_, as for instance in _Peziza succosa_, B., sometimes found growing on the ground in gardens, and in _Peziza saniosa_, Schrad., also a terrestrial species, the same phenomenon occurs. To this might be added such species as _Stereum spadiceum_, Fr., and _Stereum sanguinolentum_, Fr., both of which become discoloured and bleeding when bruised, while _Corticium lactescens_ distils a watery milk. Fungi in general have not a good repute for pleasant odours, and yet it must be conceded that they are not by any means devoid of odour, sometimes peculiar, often strong, and occasionally very offensive. There is a peculiar odour common to a great many forms, which has come to be called a fungoid odour; it is the faint smell of a long-closed damp cellar, an odour of mouldiness and decay, which often arises from a process of eremocausis. But there are other, stronger, and equally distinct odours, which, when once inhaled, are never to be forgotten. Amongst these is the fetid odour of the common stinkhorn, which is intensified in the more beautiful and curious _Clathrus_. It is very probable that, after all, the odour of the _Phallus_ would not be so unpleasant if it were not so strong. It is not difficult to imagine, when one encounters a slight sniff borne on a passing breeze, that there is the element of something not by any means unpleasant about the odour when so diluted; yet it must be confessed that when carried in a vasculum, in a close carriage, or railway car, or exposed in a close room, there is no scruple about pronouncing the odour intensely fetid. The experience of more than one artist, who has attempted the delineation of _Clathrus_ from the life, is to the effect that the odour is unbearable even by an enthusiastic artist determined on making a sketch.