AND HIS PLANT SCHOOL 47 



Passing by a class, he often stops to tie a little white string 

 around the stem of a plant in which a certain quality has 

 attracted his notice, and with which he wishes to become 



The "O. K." mark. 



better acquainted. Or, perhaps, he places on a stake or 

 a label a double cross (#). This is his "O.K." mark, 

 and whether upon a new fruit, an important manuscript, 

 or a piece of pie, which pleases his taste, it signifies work 

 well done. 



At the testing season, during the long summer days, 



