EXERCISE 32 (Continued) 



thick enough and do they fit closely enough to greatly hinder 

 evaporation of moisture ? Examine several kinds of buds for 

 the presence of gummy or varnishlike substances which might 

 assist in making the bud covering impervious to moisture. 

 Compare growing tips which have been exposed to the air for 

 some time with those from freshly opened buds, noting whether 

 the growing point actually wilts or dries more rapidly when 

 the protective covering is removed. 



May protection from mechanical injury by the bud scales be 

 of any importance ? 



Could a structure similar to the young shoot in the center 

 of this bud, but without protecting scales, be called a bud? 

 Under favorable circumstances might it be able to produce a 

 new shoot, as this bud does? Examine a geranium or other 

 house plant, and compare buds. 



Write a careful account of your observations and give your 

 opinion regarding the usefulness of the scales for protection 

 from cold, dryness, and mechanical injury. Give reasons for 

 your opinions, distinguishing carefully between observed facts 

 and inferences. 



Make a diagrammatic drawing of a longitudinal section 

 through a bud, showing the principal facts of structure. 



References 



BERGEN and CALDWELL. Practical Botany, pp. 90-92. 

 BERGEN and CALDWELL. Introduction to Botany, pp. 94-98. 



[38] 



