APPENDIX 419 



What difference do you expect to find ? Suggest the causes of 

 the difference. How would you test your suggestions ? 



6. How would you compare the amount of water given off 

 from the leaves of a branch still attached to a tree, and that 

 from the leaves of a cut branch supplied with water ? Which 

 would you expect to transpire the larger amount ? State fully 

 the reasons on which you base your answer. 



7. How is it that young tender seedlings are able to stand up 

 rigidly ? Why is it that this stiffness disappears when the 

 seedlings are killed ? 



8. What surmises would you form as to the method of 

 pollination of a flower which has a large white corolla, narrowed 

 below to a tube, with a honey-gland at its base, and which 

 emits a perfume towards evening ? 



