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drying the grain in a regulated heat; and it is pale, amber-coloured,or brown, according to the degree of heat employed.Good Mall is known by being of a full round body, and the grainswhen broken presenting a soft flour enveloped in a thin skin. Italso breaks easily between the teeth, and has a sweet mellow taste.If it breaks hard and flinty, and is not sweet and mealy, it is bad.Good malt, besides, will swim on water—the bad will sink.Patent Malt is prepared by roasting common malt till it is of a darkbrown or blackish colour from partial charring. It is employed todarken the colour of malt liquor.

MALVA. L. E. Common Mallow. Malva sylvestris. It is sometimesimproperly called marsh-mallow. It is a native plant, common inwastes and by waysides, particularly near the sea-coast. It is likethe rest of the family, mucilaginous, demulcent, and emollient, andthe decoction is used in gravel, nephritis, and strangury; externallyin form of cataplasm and fomentation, but only when the genuinemarsh-mallow cannot be procured.

Manchineel Tree. Hippomane mancinella. An American tree,which produces beautiful wood and tempting-looking fruit, but thewhole tree has the disadvantage of beingPoisonous. The fruit ulcerates the mouth, and produces swelling ofthe abdomen, with violent vomiting and purging. The green wood,when rubbed on the skin, produces inflammation, and its sawdust isso acrid and poisonous, that sawyers and carpenters are forced towork upon the wood with gauze masks. It is, I believe, a popularerror, that persons are poisoned by taking shelter or rest under itsbranches. (See Beck's Med. Jurisprudence.)

Mandragora. P. Mandrake. Alropa mandragora. A very celebratedplant from the earliest ages, said to be aphrodisiac. It is purgativeand anodyne, two properties which would make it worth a scientificinvestigation. In cataplasm it is used for scrofulous and canceroustumours.Poisonous, producing similar symptoms with the Belladonna, whichsee.

Manganesic and Manganesious Acid, were discovered by Forch-hammer, when experimenting on the Mineral Chameleon, the changein the colours of which, when thrown into water, is caused by thoseacids.

Manganesium. D. Manganese. The native black oxide, or peroxide,which contains rather less than a third of oxygen. It is black andpulverulent, and when exposed to heat gives out oxygen gas inabundance. Mixed with common salt, sulphuric acid, and water;it is also employed in fumigation.