410 UDALE, J.— Gardening for All, p. 20. 



411 von UNWORTH, ( ).— Zur Vertilgung von Hederich 



durch Bespritzen mit Eisenvitrol (?) 



Ztschr. Landw. Karamer Schlesien (1899), S. 880. 



Deut. Landw. Presse 26, S. 639. 



Does not recommend S. of I. for killing weeds. 



412 VANDERVAEREN, J.— Destruction des Sanves. 



Jour. Agr. Prat. n. Ser. 5, (1903), No. 23, p. 731. 



E. S. R., 15, 266. 



Application of 200 Kgo. dry powdered S. of I. per hectare. This 

 method generally practiced in Belgium. 



413 VANDEVELDE, A. J. J.— tiber den Einfluss der Chem- 



ischen Reagentien und des Lichtes auf die Kei- 

 mung der Samen. 



Bot. Centbl., Bd. 69, (1897), S. 337-342. 



S. of I. extraordinarily injurious to the germination of Pisum 

 sativum. 



Soaked seed for 24 hrs. in solutions of S. of I. and with the 



following result : 



0.5% 1.0% 3% Solution 



Per Cent Germinated 54-00 12.67 6.00 



Germination Energy 3.8 7.2 4.90 



414 VAUCLUSE COMITE D'ETUDES ET DE VIGIL- 



ANCE. 



Le Phylloxera An. II (1878) p. 184. 



Results with Sulphate of Iron were negative. 



415 VIALA & FERROUILLAT.— Traitement des Maladies 



de la Vigne (1888), p. 84. 



416 VESTERGAARD, A. B.— Udryddelse af Agersennep af 



Jernvitriol. 



Ugeskr. Landm. 47, (1901), No. 47, p. 451. 

 E. S. R. 13, 756. 



417 VILCOQ, M. A. — Les Engrais en Horticulture. 



Bui. Soc. Agr. France, (1902), p. 612. 



