PLATE 65 



A. — Two pods of beans, the one at the left injured by stinscald, the one at the right 

 having been protected from the rays of the sun. The pod at the left was exposed to 

 the sun in the position shown. The pod at the right was covered by slipping it 

 through a slit on the back edge of the muslin sack. 



B. — Four groups of bean pods exposed tied in muslin sacks. The two at the left 

 were slightly spotted as shown when the experiment began. 



