Car'ica Papa'ya, Pawpaw, Melon Tree; Papayotin, Papain, Caricin. -- An albuminous ferment from the fruit; Tropical America. Tree 6 M. (20 degrees) high, stem 30 Cm. (12') thick, fruit approximates the size of one's head, and contains an acrid, astringent, bitter, milky juice, which soon separates into a coagulum and aqueous liquid, from which latter papayotin is precipitated upon the addition of alcohol. It is a whitish, hygroscopic powder, inodorous, tasteless, soluble in water, glycerin, active in neutral, acid, but more so in alkaline solutions; it converts starch into maltose, albuminoids into peptones, and emulsifies fats; should digest 200 times its weight. Papoid, Caroid, etc., are weaker forms (dried juice); slightly inferior to pepsin, greatly inferior to pancreatin. Dose, gr. 2-5 (.13-.3 Gm.).