27 BIEDENKOPF, H.— Zur Frage zur Bekampfung des 



Hederichs, speziell durch Metallsalzlosungen. 



Deut. Landw. Presse, No. 46 (1901), S. 406. 



Has made no study of what he writes, but thinks that no quanti- 

 tative work has been offered on yield from sprayed vs. un- 

 sprayed plots. Thinks soil injured and plants poisoned. 



28 BIRNER & LUCANUS.— Wasserculturversuche mit Ha- 



fer. 



Landw. Vers. Stat., Bd. VIII (1886), S. 14S. 



Manganese can in no way replace iron. Ferrous salt (phos- 

 phate) can replace ferric phosphate to advantage. 



29 BLACKMAN, ( ).— (Iron filings benefitted pear trees.) 



Fla. St. Hort. Soc. (1903), p. 103. 



30 VON BLUCHER, ( ).— (Hederichvertilgung.) 



Ann. Landw. der Mecklenburg Vereins (1903), No. 22. 



31 BOIRET, ( ). — (Die zerstorung der Kleeseide durch 



Eisensulfat.) 



Jour. Agr. (Paris) (1899), T. 11, p. 779. 



32 BOIRET, H. & G. PATURAL.— Recherches sur l'emploi 



agricole du sulphate de fer. 



Ann. Agron., T. 18 (1892), p. 417. 



33 BOLLE, ( ). — (Anthracnose of Grape.) 



Atti memorie dell'Instituto di Gorizia, 1892. 



Recommends a mixture for Anthracnose of grape. 



Sulphate of Iron So Kgo 



Sulphuric Acid 5 " 



Water 100 " 



Dissolve the S. of I. in hot water, then add the acid and stir 

 well. Use before cold, applying to the vines with brush or 

 swab. Apply 15-20 days before buds start to open. 



34 BOKORNY, TH.— Eine bemerkenswerthe Wirkung Oxy- 



dierter Eisenvitriollosungen auf lebende Pflan- 

 zenzellen. 



Ber. Deutsch. Bot. Gess. VII, Heft 7. 



