SAP VESSELS, 



69 



been postponed^ until a decree of the present 

 assembly^ in whicb I possess a casting vote^ 

 had been obtained." 



I am sorry if I have done any harm^ Sir/' 

 said Frederick ; but I think the tree will 

 not die from the loss of its turpentine, I do 

 not see any." 



You expected then/' said Mr. L. a full 

 stream^ as big as the hole you have made^ to 

 start from the tree^ like beer from a spigot ? — 

 Now^ think a little. A barrel is a hollow thing, 

 which, hem^ filled with a fluid, and nothing 

 else, naturally loses it in a continued stream, 

 through any aperture made in it. But do not 

 you know that the bark you have pierced 

 encloses hard timber, as well as sap ; which sap 

 is contained in minute capillary or hair-like 

 vessels, or pores, which extend up and down 

 the trunk ? These, therefore, must have time 



