86 



BUDS 



insects by a coating of wool or down, which they afterwards 

 lose. The leaves of the tulip tree are inclosed for a little time 



FIG. 86. Types of vernation 



1, 2, cherry; 3, 4, European walnut; 5, 6, snowball; 7, lady's mantle; 8, oxalis. 



After Kerner 



D 



FIG. 87. Development of an oxalis leaf 



A, full-grown leaf ; B, rudimentary leaf, the leaflets not yet evident ; C, more 

 advanced stage, the leaflets appearing; D, a still more advanced stage. B, C, 

 and D, considerably magnified. After Frank 



