104 



The Philippine Journal of Science 



The oils extracted from the roasted bean and from the raw bean 

 have the indices of refraction and the saponification numbers 

 given in Table III. 



Table III. — The constants of the oils of ipel and those of coffee.'^ 





Index 

 of re- 

 fraction. 



Sapon- 

 ification. 



Ipel: 



Raw 



1.4670 

 1. 4690 



1.4695 

 1. 4715 



196.2 

 190.7 



157.2 

 162.6 



Roasted 



Coffee: 



Raw 



Roasted . . 





» Konig, Ice. cit. 



DISCUSSION 



Ipel has no possibility of becoming of any great commercial 

 value, but it has a local significance. Viewed in relation to the 

 world's production of coffee, it is infinitesimally insignificant. 



Table IV. — Average annual production of coffee by continents. Years, 



1906-1910. 

 Continent. Pounds. 



South America 2,021,805,000 



North America 384,138,000 



Asia 92,818,000 



Africa and Oceania 21,998,000 



The properties of ipel are discussed here because of its local 

 use as a coffee substitute or adulterant. 



