THE TREE DOCTOR 



15 



Photo 2 

 The Bearer of Unsound Fruit. 



structure of the trunk, branches and twigs. Nothing could -be 

 more educational than to turn back to your botany and see how 

 beautifully this system is built. Remember, the upward flow of 

 sap is not under the bark, where you see such a copious supply 

 of a liquid something that you call "sap ;" for this is not "sap," 

 but "cambium," as the scientists call it ; it is sap that has been 

 ''worked over," so to speak, in the leaf ; it might be called "tree 

 blood," (it answers to blood in the animal body) and it returns 

 under the bark, between that and the last year's new wood, build- 

 ing another new layer. Now, bear this in mind, viz ; in its up- 

 ward flow it is inside, within the cells of the wood. 



Now, look at the hideous wounds in Photos 3, 4 and 5 (and 

 there are millions worse than these.) After pure sap has started 

 from the roots and then has to pass through this sickening virus, 

 can you reasonably expect that when it comes to the factory 



