CITRUS CULTURE IN PORTO RICO 



9 



:ng sprouts emanating from the stock should be used as the standard 

 with which to compare the unknown. A piece of this root should 

 be washed and wiped, and the bark should be scraped from it. A 



Figure 2. — Grapefruit budded on sour orange stock. Trees are the same age as is 

 that shown in Figure 1 and are planted adjacent to it 



Figure 3. — Leaf forms of citrus : A, Lemon without apron : B. grapefruit with apron 

 overlapping leaf blade ; C, sour orange with apron not overlapping leaf blade ; D, 

 sweet orange with small apron ; E, lime, very small leaf with very small apron 



1-gram sample should be macerated in a mortar with a few cubic 

 centimeters of water, after which about 20 to 30 cubic centimeters 

 of water should be added. One cubic centimeter of a 5 per cent 



87036°— 30 2 



