INDEX 



189 



Wunsh, D. S., 146 



Yellows of lucerne, 87-8 



of tea plant, 56 

 Yellow-tip, 94 

 Yellow-top, 87-8 

 Young, R. S., 11 



Zea mais, see Maize 



Zinc, determination of, in plant ash, 

 37-41 

 function of, in animals, 150-1 



in plants, 98-101, 109-12 

 species requiring, 14-16 

 as micro-nutrient, 3, 7—8 

 content of plants, 73 

 deficiency diseases, 68-80 

 in almond, 74 



Zinc, deficiency diseases, in apple, 74 



in apricot, 69-71, 74-5 



in Citrus, 69-70, 76-7 



in garden pea, 71 



in grape, 74 



in maize, 69, 75-6. 79-80 



in milo, 71 



in peach, 69-71, 74 



in pear, 74 



in pecan, 71-4 



in Pinus radiata, 78-9 



in plum, 74 



in tomato, 69-70 



in tung, 77-8 



in walnut, 74, 77 



in wax bean, 71 

 in animals, 125-6 

 Zinc-deficient leaves, cytology of, 69-70 



