Catechu, or Mimosa Catechu, L. or sensitive plant, which is a native of the East Indies, and comprises above sixty species. From this plant is produced the extract denominated catechu, which was for a long time erroneously called Terra Japonica, from the earthy particles it contains; but which are entirely adventitious, and consist of impurities adhering to it, while in the furnaces, or kilns, in which it is prepared.

The extract of Catechu, when in its purest state, is a dry sup-stance, which may be reduced to powder, and almost entirely dissolved in water, or in spirits of wine. It is a mild, but excellent astringent, and leaves in the mouth an agreeable sweetness. - This medicine is more particularly useful in alvine fluxes; and where, on this account, astringents become necessary, it is, perhaps, the most salutary. It is also successfully employed in complaints peculiar to females, laxity and debility of the viscera, in general, and in various other diseases, which require, strengthening" remedies.

When dissolved in the mouth, the catechu has frequently afforded relief for weak and ulcerated gums, for aphthous eruptions, or the thrush, and similar affections.

The best form in which catechu can be taken, is that of simple infusion in warm water, with the addition of cinnamon, or cassia : thus it is freed from its impurities, and rendered more palatable. It is given in doses from fifteen to forty grains, according to the age and constitution of the patient,