NOTES AND ABSTRACTS. 



293 



(3) The table of dilutions for various times and purposes, with 

 some recipes for the addition of ortho-arsenates, Pb 3 (As0 4 ) 2 , lead 

 acetates, and lead arsenates for the prevention of burning by summer 

 spraying. — G. P. C. 



Liming plus Chemicals on Grass Lands, the Value of (U.S.A. 

 Exp. Sin., Rhode I., Bull. 148). — The use of 3 tons ground limestone plus 

 chemicals increased the yield tremendously, especially where the sod 

 was poor and the land re-seeded. Some further experiments were 

 carried on on beets, melons, and oats. 



The addition of ground limestone gave increase in all cases, especi- 

 ally with melons, where the yield was twice as great. — G. P. C. 



Ling and its Varieties. By D. (Garden, p. 528, Oct. 19, 1913). — 

 Ling (Calluna vulgaris) is nearly related to the Heaths, but differs in 

 leaf arrangement. In Erica the leaves are loosely in whorls, in Calluna 

 they are closely parallel and disposed so as to give a four-angled 

 appearance. 



There is only one species of Calluna, but it is prolific in varieties. 

 On the same hill the flowers may be found to vary from the common 

 light red to white or dark red. White is the most popular, and there 

 is now a considerable trade in white Heather. 



A good selection is the following : 



Strong-growing, white : alba, alba rigida, alba Serei and Ham- 

 mondii. 



Dwarf, white : alba minor, alba pumila. 

 Strong-growing, red : Alportii, rubra, flore pleno. 

 Golden and copper leaves : aurea, cuprea. 



Dwarf, but not free flowering : Foxii hypnoides, minima, pygmaea- 



H. R. D. 



Lophodermium nervisequum (DC.) Fr. By P. Spaulding (Myco- 

 logia, iv. pp. 149-150 ; May 1912). — The leaves of Abies balsamea 

 are caused to turn yellow soon after infection, which occurs in June, 

 and by the beginning of winter they become brown. In spring the 

 epidermis splits along the entire length of the leaf and exposes the 

 fruits of the fungus. The disease is most prevalent on the lower parts 

 of the trees and on young trees which have been heavily shaded by 

 older ones. It has not yet appeared in nurseries, where this tree is not 

 often grown. — F. J. C. 



Magnesia for Roses (Gard. Chron., p. 481 ; December 28, 1912). — 

 A concise account of experiments, the result being summed up thus 

 by M. Cochet : — 



1. Magnesia exercises a definite influence on the growth of Roses. 



2. Employed in the form of carbonate to Grifferais stock, it aug- 

 ments development and prolongs growth into autumn, enabling the 

 plant to retain its leaves. — E. A. B. 



