PLATE 4 
Plant at right, which is normal, was watered with the complete nutrient solution 
described on page 35, including magnesium sulphate, the solution being added in 
excess so as to produce a leaching effect. Plant at left received the same treatment in 
all respects, except that magnesium sulphate was omitted from the nutrient solution. 
Note the advanced stage of sand drown, in which the leaves hang limp. Note, how¬ 
ever, that the leaf tissues remain alive and seed formation is successfully accomplished. 
