NOTES AND ABSTRACTS. 



477 



Regeliocyclus Kovparib and Oncocyclus Susiana, which latter it much 

 resembles. Some interesting notes on the cultivation of the section 

 generally. — C. T. D. 



Land, The Use of Explosives in Clearing. By J. F. Kadonsky 

 (U.S.A. Exp. Stn., Wisconsin, Ball. 216 ; Nov. 1911 ; 20 figs.). — The 

 presence of resins in pine stumps makes their natural decay a very 

 lengthy process, and this bulletin gives the results of investigations 

 into the methods of removing them by the use of explosives. — A. P. 



Lands, Peaty Swamp ; Sand and Alkali Soils. By C. G. 



Hopkins, J. E. Readhimer, and 0. S. Fisher (U.S.A. Exp. Sin., Illinois, 

 Bull. 157 ; July 1912 ; 7 plates). — There are immense areas of peaty 

 swamp lands in the northern parts of Illinois, and as a rule they grow 

 poor crops. The field experiments here detailed show the application 

 of potash to these soils to have considerably increased their productive 

 capacity. — A. P. 



Leptospermum seoparium, New Varieties of. By D. Bois (Rev. Hort. 

 Nov. 16, 1912 ; pp. 520-1 ; coloured plate). — This represents two very 

 pretty varieties : one, L. s. Nichollii, with an abundance of small deep- 

 rose flowers, the other, Boscawenii, raised in Cornwall, with larger flowers, 

 white, with rose-red centre. Both very attractive, of Australian origin, 

 but only suited for mild climates, such as Cornwall, the Scillies, or the 

 West of Ireland.— C. T. D. 



Lilies in 1912. By A. Grove (Gard. Chron. Jan. 4, 1913, p. 1). — 

 Useful notes on behaviour and cultural requirements of new and 

 rare lilies. — E. A. B. 



Lilium candidum (Rev. Hort. July 16, 1912 ; p. 318). — If the 

 stem be severed low down, when the first flowers are just opening, and 

 inserted in soil kept very moist, after a short period of flagging, the 

 plants resume vigorous development and perfect their blooms 

 successively for a fortnight. The foliage, however, becomes yellow 

 and perishes. — C. T. D. 



Lilium regale (syn. L. myriophyllum Hort., non Franchet.). By 

 E. H. Wilson (Gard. Chron. June 21, 1913, p. 416 ; 2 figs.). — Account 

 of the discovery of and a table of differences compared with, 

 Franchet's type specimen. — E. A. B. 



Lime and Magnesia, Effect of various Ratios of, on the 

 Growth of Plants. By P. L. Gile (U.S.A. Exp. Stn., Porto Rico, 

 Ann. Rep. 1911 ; pp. 18, 19). — This has been tested by growing rice in 

 nutrient solutions of the chlorides of these elements, the various ratios 

 of lime to magnesia from 10 : 1 to 1 : 10 being tried. The results show 

 that while the ratio appears to exert an action at comparatively high 

 concentrations it does not at low concentrations, at least not within 

 the ratios tried. It appears that the question is not the simple one 

 of a balancing of lime with magnesia, but of these two with all the 



