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MISSOURI BOTANICAL GARDEN. 



When the seedling becomes older the plumule may be rec- 

 ognized between the two cotyledons. This ordinarily does 

 not develop until the second year. For this and later stages 

 the reader is referred to the papers quoted above, especially 

 to that of Julius Pohl. 



EXPLANATION OF PLATE. 



Plate 8. — Hydrastis canadensU. Germination stages, X 2; and more 

 advanced seedlings, natural size. 



