192 POPULAR ECONOMIC BOTANY. 



Pi-pi. — The ripe pods or legumes of Casalpinia Papai 

 (Nat. Ord. Leguminosa). (Plate XII. fig. 63.)— This tan- 

 ning material more frequently comes mixed with Divi-divi, 

 than as a separate importation, and when so mixed decreases 

 the value of the latter. Sometimes, though rarely, small 

 quantities of Pi-pi are imported, but it is not much valued. 



Algarobilla, Algaroba. — The legumes of a species 

 of Prosopis, supposed to be P. pallida (Nat. Ord. Legumi- 

 noscB). — Most of the species of Prosopis have short round- 

 ish pods with a wavy outline longitudinally; the seeds 

 therein are enveloped in a sweetish pulp, which in some of 

 the species is also possessed of considerable astringency. 

 When ripe the pods fall off the trees, and they soon decom- 

 pose and run into a mass with the pulp, and a resinous juice 

 contained in the shells of the pod. This mass is collected 

 when dried, packed into bags, and exported ; the material has 

 a very destructive effect upon the bagging, so that it usually 

 reaches this country in bulk, the packages becoming de- 

 stroyed on the voyage ; it is not very useful, and is only 

 occasionally imported. About 700 tons have been received 

 at the port of Liverpool. 



Neb-neb.— The dried pods of Acacia Nilotica. (Nat. 

 Ord. Leguminosa, Suborder Mimosece.) — These Minosa-pods, 



