314 PHIPSON, T. L.— Sur l'hematine vegetale. 



Compt. Rend. Acad. Sci., (Paris), T. 112, (1891), p. 666. 



The red coloring matter in the algae Palmella cruenta contains 

 iron. 



315 PI CHARD, P.— Influences comparers du sulfate de fer 



et du sulfate de chaux sur la conservation de 

 l'azote dans les terres nues et sur la nitrifica- 

 tion. 



Compt. Rend. Acad. Sci., (Paris), T. 112, (1891), p. 1455. 

 Jour. Agr. Prat. (1891), T. II, p. 50. 

 Ann. Chim. et Phys., T. 25, Ser. 6, p. 271. 



Salts of iron in general injuriously affect ferments which destroy 

 nitrogenous matter, but organic iron salts favor nitrification. 



So long as S. of I. has no opportunity to oxidize it has same 

 effect on nitrification that gypsum has, though in less degree. 



316 PLATZ, K.— ( Vertilgung von Unkraut.) 



Fuhling's Landw. Ztg., Bd. 51, (1904), S. 415. 



317 PORCHER, E. P. — Diseases and Insects of the Citrus. 



Fla. Sta. Hort. Soc. (1902-1903), p. 39. 



"Frenching or French leaf can be overcome by proper fertiliza- 

 tion, by ditching, or by the use of J4 lb. of Sulphate of Iron or 

 carbonate of iron around the trees, either finely ground or 

 sprinkled around, or dissolved in water and applied about the 

 tree." 



318 QUANTIN, H. — Effets opposes que le sulfate de fer peut 



exercer sur la vegetation. 



Jour. Agr. (Paris), T. II (1887), p. 13. 



319 RASSIGUIER, ( ).— ( .) 



Messager Agr., Mars. 10, (1892). 

 Results in the years 1890-91. 



320 RASSIGUIER. — Traitement radical de la chlorose. 



Prog. Agr. et Vit. T. 18, p. 204. 



321 RASSIGUIER, ( ). — Du Badigeonnage au sulfate de 



fer et de ses resultats. 



Prog. Agr. et Vit. T. 24, (1895), p. 43L 

 Successfully used against chlorosis and anthracnose. 



