ABSTRACTS. 



947 



Leaf- arrangement in Cellular Plants, The Mechanical 

 Theory of. By Dr. H. Seckt (Beih. Bot. Cent. bd. x. ht. 4 and 5, 

 pp. 257-278, plates 1 and 2). — The author describes and figures the leaf- 

 origin in various Mosses and FloridecB. The paper contains many 

 references to the literature of the subject ; in general his position seems 

 to be in favour of the mechanical theory as opposed to the views of Kny, 

 Berthold, and Rosenvinge. — G. C. S.-E. 



Leaf, Unfolding" of the. By G. Hinze (Beih. Bot. Cent. bd. x. 

 ht. 4 and 5, pp. 224-256, plate 1). — The paper contains exact details of 

 the unfolding of the leaf in a great many special cases. Occasionally the 

 vernation differs even in the same bud. As an example of the method 

 Castanea vesca may be described. The apex of the whole shoot bends 

 sideways like a bow ; the straightening follows soon after, when the growth 

 becomes rapid. The downward curvature of the leaf is caused almost wholly 

 by the bending of the stalk. The blade opens basifugally, and becomes 

 strongly arched. The transverse folds of the leaf vanish when the 

 lamina becomes upright. — G. F. S.-E. 



Libocedrus macpolepis. By M. T. M. {Gard. Chron. No. 783, p. 

 467, December 28, 1901). — This genus is very closely allied to Thuya, 

 and is widely distributed. L. macrolepis is a native of China ; it was 

 first discovered in the province of Yunnan, and afterwards in Formosa, 

 where it furnishes valuable timber. It has been introduced into cultiva- 

 tion by Messrs. J. Veitch & Sons, but it is uncertain whether it will prove 

 hardy in this country. A description of the plant is given. — G. S. S. 



Lilium speciosum. By Arthur R. Goodwin (Gard. p. 313 

 9/11/1901). — A successful grower of this plant and its many varieties 

 gives his exparience of how it may best be treated. An illustration of a 

 bed of L. speciosum accompanies the notes. — E. T. C. 



Lime : Effect on Different Crops on Acid Soils {U.S.A. Dep. 

 Agr. Bull. 133, Exp. Stn. Work, xviii. 1901). — k.n acid condition of the 

 soil being found to be more prevalent than is usually supposed, experi- 

 ments were made with lime at the Rhode Island Station. The principal 

 result was an indication of the plants benefited by liming (amongst others, 

 Rhubarb, Asparagus, Red Raspberry, Red and White Currants, Barley, 

 Oats, Spring Wheat, Mangel- Wurzels, Onions, English Turnips, Sweet 

 Peas, Balsams, Poppies, &c.), plants not benefited by liming, and plants 

 giving inconclusive results with liming. — C. H. C. 



Lime-washing Trees. By E. Oavray {BulL Soc. Hort. Loiret, 

 tome vi. No. 13, p. 577 ; 1901). — Points out error made in mixing washes 

 by using acids and alkalis that neutralise each other. — E. A. B. 



Liverworts. ("Ueber die im Jahre 1900 in Baden gesammelten 

 Lebermoose.") By Karl Miiller, Freiburg i. Brg. (Beih. Bot. Cent. bd. x. 

 ht. 4, o, pp. 213-223). — A list of sixty-seven Hepaticce collected in 

 Baden by the author, with full details of habitat and locality. 



G. F. S.-E. 



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