94 



PHYSIOLOGY OF NUTRITION 



Fig. 64. — Wheat plants grown in extract of toxic soil- i and 2, undiluted extract; 3 and 

 4, equal parts of extract and distilled water; 5 and 6, one part extract diluted with nine 

 parts of distilled water. (After Schreiner and Shorey,. Reproduced by pcrmissicn of U. iS, 

 Depl. Agric. 1909.) 



Frc. 65.— Vicia faba (Windsor bean) plants grown in water extract of bog-soil and in boK 

 wa er. L extract; 2, bog water; 4, bog water neutraUzed with calcium carbonate- ^ 

 water treated with carbon-black and filtered. (Afler Dachno7fski.) ' 



bog 



