384 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Maple-Poplar zone, but in the Tamarack 12.4 inches, and in the 

 Bog Shrub 6.8 inches. 



So, as it is only in the superficial layers of soil that peat-plants 

 develop their roots, the lowering of the water-table may have very 

 important results. 



Observations were also taken of humidity and light in various 

 parts of the peat-bog. 



There is also an important discussion in the paper as to what 

 exactly causes the dry-climate characters of many peat-plants. The 

 author agrees with Davis in believing that this is mainly due to the 

 drying of the surface layer and the ability of peat to hold large 

 amounts of water which cannot be drawn off by plants. At the same 

 time, the alleged poisonous character of the soil substratum in bogs 

 would result in toxins of the bog-water reaching the roots as soon 

 as the superficial layer becomes dried by evaporation. — G. F. S. E. 



Peat Moss, Manurial Value of. By H. von Feilitzen {Gard. 

 Chron. p. 404; June 22, 1912). — Written to combat an unfavourable 

 report on this manure in Journal of the Board of Agriculture, Dec. 1911. 

 The writer thinks the ill-results obtained at Kew must have been due 

 to other causes than the use of peat moss. — E. A. B. 



Pelargronium zonale *Le Poitou.' By Viaud Bmant {Rev. 

 Hort. p. 304, July 1, 1912 ; coloured plate). — The plate represents, 

 somewhat reduced, a very beautifully tinted umbel of well-formed 

 and large flowers of the * Bruant ' (Poitiers) strain. Described as 

 having the three inferior petals brilliant violet margined with red, and 

 the upper ones red and violet, freely spotted with red, from which, 

 however, the illustration differed largely. In it the flowers are a 

 warm magenta, slightly suffused with violet, the centre deep orange 

 with radiating red streaks. — C. T. D. 



Penetration of Inorg-anic Salts in Treated Wood, A Visual 



Method for Determining- the. By E. Bateman {U.S.A. Dep. Agr., 

 Forest Service, Circ. 190; Nov. 9, 1911). — An interesting account of 

 tests that have been made for determining the depth of penetration 

 which has been attained by zinc chloride or other salts. — A. D. W. 



Perovskia atriplicifolia {Bot. Mag. t. 8441).— Afghanistan to 

 Western Tibet. Family Lahiatae; tribe Monardeae. Shrub, 3-5 feet 

 high. Leaves ovate-lanceolate, 1^-2^ inches long ; inflorescence panicu- 

 late ; corolla blue. — G. H. 



Perovskia atriplicifolia. By E. W. {Oestr. Gart. Zeit., vol. vii. 

 pt. v., pp. 186-187). — Perovskia atriplicifolia is a shrub attaining a 

 height of five feet, found in Afghanistan and the Western Himalaya. 

 Its leaves are covered with down. The numerous flowers are blue- 

 violet with white throat. — S. E. W. 



Pine in the Southern States, Cause, Extent, and Remedy, 

 The Dying" of. By A. D. Hopkins {U.S.A. Dep. Agr., Farmers' 



