334 



Journal of Agriculture, Victoria. [11 June, 1917. 



It is obvious, therefore, that Nature's engineering arrangements, by 

 which, during the periods of growth, the continuous stream of life-giving 

 sap is carried through, and controlled in the various sap channels of the 

 tree, are so perfectly organized, that they are marvels of her mechanical 

 ingenuity. 



The different parts of the tree are made up of countless millions of 

 small cells constructed in various shapes according to the positions which 

 they occupy in the tree edifice. 



Plate 91.— Fig. 1, section of Feeding Root highly enlarged. 

 Natural size and magnification marked n and b on Fig. 1 and a on Fig. 2. 



Owing to the keenness of competition and friendly rivalry which 

 exists among the various fruit-growing States it behoves every person 

 entering into fruit production to become possessed of at least a fairly 

 good, elementary knowledge of the structural formation of his trees, and 

 the functions of their various organs. This necessity is becoming daily 

 more apparent on account of the advnnccment of horticultural science 

 supported by industrial effort, and fostered by the Commonwealth and 

 by the various State Governments. 



