1917] Lipman-Gericke : Smelter Wastes and Barley Growth 545 



Namba,^*' Voelcker,''^ Kelley,^* and Guthrie and Cohen.''^ As 

 opposed to these, however, we have numerous cases on record 

 of the stimulating effects of manganese to plants grown in soil, 

 and even the work of the investigators last named is by no means 

 to be considered as absolute evidence against such action of man- 

 ganese, since the toxic action observed was in some cases verj^ 

 slight, and some of the concentrations involved were so un- 

 usually high as to leave little expectation of anything but 

 toxicity of manganese for the plants tested. Among the in- 

 vestigators referred to who have furnished evidence of the 

 stimulating effects of manganese, may be mentioned Voelcker,^"" 

 Bertrand,^"^ Koxas,^°- Loew and Sawa,"^ Nagaoka,"* Loew and 

 Honda,i°^ Fukutoma,^'"' Namba,^"^ Uchiyama,^°^ Takeuchi,^^^ 

 Feilitzen,^^" Strampelli,"^ and Lipmau and Wilson."- While in 

 this review we have omitted a number of the investigations bear- 

 ing on the subject, enough have been given to indicate clearly 

 the trend of the evidence in hand. Fuller bibliographies may 

 be obtained in the excellent reviews of the literature given by 

 Brenchley"^ and by Kelley.^^* 



Comparing the results of other investigators with ours, some 

 interesting differences, as well as similarities, between them be- 

 come evident. For example, we are in accord with most of the 

 investigations above reviewed as favoring the existence of stimu- 



96BuU. Col. Agr., Tokyo Imp. Univ., 7, p. 635. 



97 Jour. Eoy. Agr. Soc. Eng., 64, p. 348. 



98 Jour. Ind. Eng. Chem., 1, p. 533. 



99 Agr. Gaz. N. S. Wales, 21, p. 219. 



100 Jour. Eoy. Agr. Soc. Eng., 44, p. 348. 



101 Compt. Eend., etc., 124, p. 1032. 



102 Philippine Agr. and Forester, 1, p. 89. 



103 Flora, 91, p. 264. 



101 Bull. Col. Agr., Tokyo Imp. Univ., 5, p. 467 ; 6, p. 135. 



105 Bull. Col. Agr., Tokyo Imp. Univ., p. 6. 125. 



106 Bull. Col. Agr., Tokyo Imp. Univ., 6, p. 137. 



107 Bull. Col. AgT., Tokyo Imp. Univ., 7, p. 635. 



los Bull. Imp. Cent. Agric. Exp. Sta., Japan, 1, p. 37. 



109 Jour. Col. Agr., Tokyo Imp. Univ., 1, p. 207. 



110 Jour, fur Landw., 55, p. 289. 



111 6° Cong. Internat. Chem. Appl. Eoma, 4, p. 14. 



112 Bot. Gaz., 55, p. 409. 



113 Inorganic plant poisons and stimulants, Cambridge, 1914. 



114 Hawaii Agr. Exp. Sta., Bull. no. 26. 



