196 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Zephyranthes cardinalis {BoL Mag., tab. 8553). — America. 

 Nat. Ord. Amaryllidaceae, Tribe Amarylleae. Leaves ligulate, 

 acuminate, 5J inches long. Scape 4} inches long. Spathe rose-pink. 

 Perianth bright red, 3 inches across, expanded. — G. H. 



Zine Arsenite and Arseniate of Lead, Comparative Tests with. 

 By W. J. Schoene {Jour. Econ. Entom. vi. pp. 157-159 ; April 

 1913). — ^The author found zinc arsenite (i lb. to 50 gallons of 

 water) somewhat quicker in poisoning caterpillars than lead arseniate 

 (3 lb. to 50 gallons) , especially when the caterpillars were on the fohage 

 when the spray was appHed. The tests were made on a variety of 

 pests and plants, and with and without Bordeaux mixture, lime, 

 lime-sulphur, &c. The two substances were about equally adhesive 

 to the foliage. In combination with other substances both proved 

 somewhat repellent for a time ; afterwards they were eaten, but only 

 when they had lost some of their effectiveness. The foHage of apples 

 was uninjured by zinc arsenite when it was mixed with lime or 

 Bordeaux mixture, but slight burning occurred at the leaf margins 

 when lime-sulphur was used with it, and rather more with other 

 things and by the zinc salt alone. This burning was also evident 

 where the epidermis had been damaged, — F, J, C. 



Zinc Arsenite as an Insecticide. By W. J. Schoene {Agr. Exp. 

 Stn., New York, Bull. 28 ; March 1913 ; 3 tabs.). — ^An investigation 

 of the comparison in efficiency and safety of zinc arsenite and lead 

 arsenate. Smaller quantities of the zinc salt were found to be effective 

 as insect poisons, but against this was its liability to cause more or 

 less serious injury. In experiments upon grapes, where both fruit 

 and foliage suffered severe burning, the injury was not apparent for 

 a period varying from one to three weeks. — A. V. 



Zygadenus intermedius, Some Constituents of the Leaves of. 



By F. W. Heyl and F. E. Hepner {U.S.A. Exp. Stn,, Wyoming, 

 Ann. Rep., 1912-13, pp. 80-91). — Following the isolation of a charac- 

 teristic alkaloid, " zygadenine," the ascription of poisonous properties 

 to the resin of a similar species {Zygadenus venenosus) has led the 

 authors to extend the chemical examination of the plant to 

 other constituents. They have been unable to isolate any toxic 

 substances from the resin, and their conclusions concerning the 

 resin have been confirmed by a series of physiological tests upon 

 dogs, in which the resin administered by mouth proved to be 

 physiologically inert. — A. P. 



