496 JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



tapetum and archegonia (8 to 10), and of the development of the 

 proembryo. — G. F. S.-E. I 



Laeliocattleya X * Madame H. Martinet.' By Ch. Maion (Le I 

 Jard., Yol xxiv. No. 555, p. 104; April 5, 1910. Coloured plate).— This 

 fine hybrid has large deep rose flowers, with a wide labellum, undulated 

 and fringed at the edges, with purplish streaks, and a yellow ground at 

 the throat. It was obtained from C. Vigeriana (from C. lahiata var. ' 

 flammea x C. aurea) and Laeliocattleya x ' Mrs. Leeman ' (from 

 Laelia Dighyana x Cattleya aurea). — F. A. W . 



Landscape, Our Duty to. By M. 0. Nelson {Ann. Rep. Wis- 

 consin State Hort. Soc. 1909, vol. xxxix. p. 182). — A plea for the 

 preservation of the natural beauties of the country, if for no higher 

 reason, yet because "landscape is a tangible, taxable, marketable 

 asset." — E. A. B. 



Larch {Larix europaea). By Gifford Pinchot {U.S.A. Dep. Agr. 

 Forest Service, Circ. 70; revised August 6, 1909). — When grown in 

 good soil the wood of the larch is yellowish-white, but in cold, elevated 

 situations it is reddish-brown and much harder. It is much used for 

 shipbuilding, poles, posts, cross-ties, &c. 



On low ground it is often attacked by a fungus known as Trametes 

 pini, which so destroys the substance of the wood that the tree breaks 

 down in even a very slight wind. 



The circular describes the methods of propagation, planting, and 

 cultivation practised in the United States. — V. G. J. 



Lead Arsenate {U.S.A. Dep. Agr., Bur. Chemistry, Bull. 131). — 

 A detailed report of extensive experiments on : 



(i.) Composition of lead arsenates found on the market; 



(ii.) " Home-made " lead arsenate and the chemicals entering into 

 its manufacture ; 



(iii.) Action of lead arsenate on fohage. 



The composition of lead arsenate found on the market proved, on 

 analysis, to be very variable. The diverse results reported from all parts 

 as to the scorching powers and efficiency of lead arsenates as insecticides 

 are in a great measure due to the varying quantities of the ingredients 

 used and the larger or smaller percentage of impurities present. 



The use of "home-made " lead arsenate is recommended, as the 

 purity of the chemicals used and the methods of preparation greatly 

 influence the scorching produced by the spray. Lead arsenate can be 

 prepared both from lead acetate and lead nitrate ; the latter is preferred 

 by the author as being slightly more poisonous and as remaining in 

 suspension longer. The difference in cost of the two compounds is 

 immaterial. 



The best formula was found to be 



A. Sodium arsenate (65 per cent, strength) . Soz. 

 Lead acetate (sugar of lead) . . . 22o2. 



