Naturalisation in Extra-Tropical Countries. 423 



a depth of 64 feet vertically. The pods are eaten by the natives and 

 serve also as a good fodder for camels, cattle, and goats, the leaves 

 being of the same utility [Dr. Gr. Watt]. 



Prosopis Stephaniana, Kunth. 



Syria, Persia, Afghanistan. A shrubby species of hedge- growth. 

 Galls, common on the pods, are collected for dye- and tan-purposes. 

 [Dr. Aitchison], 



Prostanthera lasiantha, Labillardiere. 



South-Eastern Australia and Tasmania. Confined to the banks of 

 forest-streams. The only one among more than 2,500 Labiatse, 

 which becomes a good-sized tree, reaching a height of fully 60 feet. 

 Wood used for many technologic purposes. The leaves of this 

 and its many congeners afford, on distillation, aromatic oils. Most 

 of the species of this Australian genus are pleasantly and strongly 

 odorous ; among them particularly so the tall, shrubby P. rotundi- 

 folia (R. Brown), P. melissifolia (F. v. M.), P. cuneata (Bentham), 

 the latter hardy alpine, so that an aromatic oil can be distilled 

 payably from them. These plants should prove valuable on Apiary- 

 grounds also. 



Protea mellifera, Thunberg. 



South- Africa. This tall bush is deserving a place among the 

 plants of this work, not only in view of its gaudy ornamental aspect, 

 but also on account of the richness of honey-nectar in its large 

 inflorescence. 



Primus Americana, Marshall. (P. nigra, Aiton.) 



Canada, Eastern United States of America. A thorny tree, 

 furnishing the Yellow and Red Plum of North- America. Hardy in 

 Norway northward to lat. 65 [Schuebeler]. The fruit is roundish 

 and rather small, but of pleasant taste. All kinds of Prunus are 

 important to the apiary. 



Prunus Amygdalus, Stokes.* (Amygdalus communis, Linne".) 



The Almond-tree. Countries around the Mediterranean Sea and 

 South- Western Asia ; really indigenous on the Anti-Lebanon, in" 

 Kurdestan, Turkestan and perhaps on the Caucasus [Stewart]. Both 

 the sweet and bitter almond are derived from this species. The cost 

 of gathering the crop in South-Europe is about 20 per cent, of its 

 market-value. Their uses and the value of the highly palatable oil, 

 obtained by pressure from them, are well known. This oil can well 

 be chosen as a means of providing a pleasant substitute for milk 

 during sea-voyages, by mixing with it, when required, half its weight 

 of powdered gum-arabic, and adding then successively, while quickly 

 agitating in a stone-mortar, about double the quantity of water ; thus 



