Plate 7 



Plate 4h. — Barley in a nutrient solution. - From right to left: 0, 2, 10, 

 and 400 (4 X 100) Mg of Cu added. 



Plate ^h. — Barley in a "diseased" soil. — Right aud centre: no copper 

 added. — Left: 6.25 mg of Cu per pot. 



Plate 5. — Oats in a nutrient solution. — Right: without; Left: with 150 

 yug of Cu per culture. 



Plate 6a. — Oats in a "diseased" soil. — Right and centre: no copper added. 



— Left: 6.25 mg of Cu per pot. 



Plate 61?. — Wheat in a "slightly diseased" soil. — Right: no copper added. 



— Left: 25 mg of Cu per pot. 



Plate 7. — Tomatoes in a nutrient solution. — Right: 100 ng of Na.MoOj.- 

 2H-0 per culture. — Left: without molybdenum. 



