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J. J. SKINNER 



vines and 20% in marketable peas. The string beans were re- 

 duced 17% in vines and 69% in beans. It was noticeable that 

 the cowpeas growing on the vanillin-treated plot had a pale yel- 

 low color, and were weaker than on the check plot. 



Fig. 5. Yield of cowpeas, garden peas,, and string beans on check plot and 

 vanillin-treated plot. 



(1) Cowpea vines, (2) pods on check plot; (3) cowpea vines, (4) pods on vanil- 

 lin plot; (5) garden pea vines, (6) pods on check plot; (7) garden pea vines, (8) 

 pods on vanillin plot; (9) string bean vines, (10) beans on check plot; (11) string 

 bean vines, (12) pods on vanillin plot. 



The crops were photographed in the early stages of their 

 growth, and are shown in figures 2, 3 and 4. In each figure the 

 first four rows are growing on the plot to which vanillin was 

 added and the last four rows are the check plot. Figure 2 shows 



