ABSTRACTS. 



The greatest loss occurs when the Lettuce is approaching maturity. 

 'The optimum conditions for the development of the " Drop " fungus are 

 practically the same as those for the Lettuce. — C. H. C, 



Lewisia Tweedyi {Gard. p. 386, 1/6/1901 ; fig. on p. 387. See also 

 519, 15; 6 1901). — The colour description of the flowers is given, and 

 .a rough description of the plant. — H. J. C. 



Leurocline. By Spencer Le M. Moore [Journ. Bot. 464, p. 257 ; 

 ^/1901). Fig. 424. — Description of a new genus of East African Boraginece^ 

 near to Sericostoma, in which are included two species, L. lithosijcrmoidcn^ 

 here figured and described, and L. somalensis=Lohostemon somalensh^ 

 Franchet.— G. S. B, 



LibocedFus deeurrens, Disease of. By Hermann von Schrenk 

 {Bap. Miss. Bot. Gard. vol. xi. p. 67 ; 1900; plates 2, 4, 5). — Mycological 

 ^ind chemical description of a disease known as " pin -rot," erroneously 

 attributed to Dcedalea vorax, but possibly identical with the undetermined 

 mycelium producing " peckiness " in Taxodmin, — G. S. B. 



Lice, Plant. The life-history of two species inhabiting both the 

 AVitch-hazel and Birch. Theodore Pergande {U.S. Dep. Agr. Tech, S. 

 No. 9, 1901, pp. 1-44, figs. 1-23). — An intensely interesting and im- 

 ]3ortant account of Hormaphis hamamelidis, Fitch, and Hariiamelisics 

 sjyinosHS, Shimer, both of which alternately inhabit the witch-hazel 

 (Hamamelis virginica) and the Birch {Betida nigra). The paper is the 

 result of nearly twenty- two years of patient labour. — B. X. 



Lig-htning- and Trees. Anon. [Jour, of Hort. p. 210; 29/8 1901). 

 — Statistics are given of trees struck by lightning in a Swii?s wood, tend- 

 ing to show the comparative immunity of the Beech. — C. W. D. 



Ligurian Littoral, Fioriculture in the {Gard, JIag. 2,498, p. 598 ; 

 14/9 1901). — The present-day aspect of floriculture in the favoured 

 climate of Liguria is dealt with in a concise way. Since the ravages of 

 the vine disease (phylloxera) have rendered Grape-growing impossible in 

 that region, the cultivation of other objects, especially of Roses, has been 

 •carried on extensively. The flowers are grown for market and large 

 quantities are exported, and according to the report the annual value of 

 the flowers grown and sold amounts to about twenty million francs. 

 The flowers are sent to all European countries, and largely to England 

 and France. — TT'. G. 



Lilac, Forcing" Flowers of. F. van Driessche {Bee. Hort. Beige, 

 t. xxvii., p. 228, Oct. 1901), referring to an article on this subject {Bcc. 

 Hort. Beige, Jan. 1901) in which the writer showed how ether had the 

 same effect as chill, as he stated that the Lilac could not flower unless 

 submitted to frost. M. van Driessche contests this statement, describing 

 his method of flowering the Lilac in the autumn. The flower-buds are 

 formed earlv in Julv. All the leaves of the shoots are removed, onlv 

 leaving the extremities carrying the flower-buds. After eight days vege- 

 tation recommences, and flowers can be cut on August 25, — G. H. 



