430 



GENERAL REVIEW. 



in hot water for several hours previous to their being sown, as 

 the seed-coat is very hard and horny in texture. Cuttings of 

 the root are successful in some cases; and A. armata, A. Drum- 



Plant which chiefly yields the gum-arabic {Mimosa arabica); flowering 

 branch (a), and fruit (V). 



mondii, and others of the free-growing species, may be multi- 

 plied from cuttings of the young growth. A. dealbata and its 

 allies, on the other hand, refuse to root from stem-cuttings, 

 and invariably damp off, although layers are more successful. 



Amherstia (Tree of Heaven}. A showy genus of Pea-flowers, 

 represented in one or two of our gardens only by A. nobilis, an 

 Indian or Malayan species, with handsome pinnate leaves like 

 those of a Brownea, and bearing great pendent spikes of scarlet 

 golden-eyed flowers. It is slowly increased by cuttings or 

 layers inserted in a genial bottom-heat of 85 to 95. It is 

 quite possible that cuttings of the roots might develop latent 

 buds, and form plants ; or cuttings of the young growth, with 

 the apical halves of their leaves removed to prevent flagging, 

 might be grafted on pieces of the root as a stock, either by 



