48 LABORATORY PRACTICE CHAP, vin 



4. That the innermost have small structures at their tips, 



shaped something like the blades of ordinary leaves. 



5. Draw the series. 



6. From this series we learn that the bud scales really rep- 



resent altered leaves, are, as we say, homologous with 

 leaves ; and not only this, but they are really flattened 

 petioles. Q(jdi farwn*^ 



VII. Examine the scales of opening buds of the Lilac or 

 of a Pittosporum in the same way. 



1. With what part of the leaf are these bud scales homolo- 



gous? 



2. Make a sketch of the series. 



VIII. Examine the scales in opening buds of the Tulip 

 Tree, the Fig, the Beech, or the Hazel. Notice : 



1. That they are in pairs at the base of each petiole. 



2. With what part of the leaf are these scales homologous? 



3. Make a sketch of the series. 



IX. Examine the terminal buds of the Walnut, Butternut, 

 or Witch Hazel. Notice : 



1. The absence of scales. 



2. These buds are called naked buds. 



3. Make a sketch. 



X. Examine several terminal and lateral buds of the 

 Buckeye, Maple, or Lilac, cutting them into halves, longi- 

 tudinally. Notice : 



1. That some of them contain leaves only. They are leaf 



buds. 



2. That some contain both leaves and flowers. They are 



mixed buds. 



