586 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Arsenate of lead is more expensive, but is preferred by some experimenters. 

 As to equipment, the hose should be of sufficient length, say 25 to 30 feet, 

 with an 8- to 12-foot bamboo extension-rod. The Vermorel type of 

 nozzle is recommended. In order to have a fine spray the pressure 

 at the pump should be good, not less than 75 lb. for a hand pump, 

 125 to 150 lb. for a power pump. — C. H. H. 



Arctostaphylos Manzanita. By 0. Stapf (Bot. Mag. tab. 8128).— 

 Nat. ord. Ericaceae ; California. A shrub or tree growing 30 feet high ; 

 leaves ovate, l}-lf inch long; panicle corymbose; corolla white or 

 pinkish, } inch long. — G. H. 



Arctotis decurrens. By W. Watson (Bot. Mag. tab. 8162).— 



Nat. ord. Compositac ; tribe Arctoticleae ; South Africa. Herbaceous 

 perennial, 2-3 feet high, pilose ; leaves lyrate, upper sessile ; flower heads 

 solitary, 3 inches diameter ; ray white above, purple below disc ; teeth 

 dark purple ; tube yellow. — G. H. 



Astilbe Davidii. By S. Mottet (Rev. Hort. January 16, 1907, 

 pp. 39-41 ; coloured plate and woodcut). — The plate depicts a very 

 charming flower spike, bright rose and mauve flowers, very distinct. 



C. T. D. 



Azara microphylla. By S. Mottet (Le Jardin, vol. xxi. No. 492, 

 p. 244 ; August 20, 1907 ; 1 fig.). — An attractive flowering shrub, 

 4 to 6 feet high, half-hardy near Paris. Small shiny evergreen leaves, 

 abundance of tiny flowers with an aromatic scent, apetalous, but appearing 

 yellow from the colour of the anthers. Flowers in April. Small orange 

 berries, ripening in autumn. Native of Chili. Other species are 

 A. dentata, A. Gilliesii, and A. integrifolia. Of the last there is also 

 a pretty but exceedingly rare variety with variegated leaves. — F. A. W. 



Bag Method Of Keeping" Grapes. By F. Charmeux (he Jardin, 

 vol. xxi. No. 489, p. 196 ; with 4 figs. ; July 5, 1907). — Covers much the 

 same ground as the previous articles, but the figures are useful as showing 

 how the bags are to be applied. Will be followed by further details in a 

 later number. — F. A. W. 



Barium Chloride as Insecticide. By J. Barsacq (Le Jardin, 

 vol. xxi. No. 490, p. 214 ; July 20, 1907).— Barium chloride infallibly 

 destroys grubs such as Gastrophysa raphani, and is perfectly innocuous 

 to man. As the solution is colourless and leaves no trace, it is advisable 

 to colour it with a little flour or other inert substance, so as to see which 

 parts of the affected plant have been treated. — F. A. TP. 



Beans, Garden, American Varieties of. By W. W. Tracy 



(U.S.A. Dep. Agr., Bur. PI. Ind., Bull. 109, 1907 ; 24 plates).— Another 

 of the series of volumes in course of preparation by the U.S. Department 

 of Agriculture, attempting to substitute the precision of scientific method 

 and classification for the looseness and uncertainty hitherto prevailing in 

 the description of the varieties of garden vegetables, with a view to the 

 simplification and reduction of varietal names and the establishment of 



