May 13, 1918 



Stability of Olive Oil 



359 



PHYSICAIv TESTS 



The refractive index of the different series was determined for a number 

 of years by means of an Abbe ref ractometer. The readings did not indi- 

 cate any appreciable change in the oil except with air-hght and with air- 

 light-moisture, where gains of approximately o.ooi were noted. The 

 results for the year 1912 corrected are given in Table II. Those for 1913 

 and 1 914 gave like differences and are not reported. 



Table 11.— -Refractive index for the olive oil, igi2 



A 

 E 

 C. 

 D 

 E 

 F. 

 G 

 H 

 I. 



Conditions of the experiment. 



Control 



Enzym-free 



Air 



Light 



Moisture 



Air-light 



Air-moisture 



Light- moisture. .. 

 Air-light-moisture 



I. 4687 

 I. 4687 

 I. 4690 

 I. 4690 

 I. 4690 

 I. 4700 

 I. 4689 

 I. 4689 

 I. 4702 



A lyovibond tintometer was employed for determining the color of the 

 oilin 1 91 5 and 191 6. The supply of standard glasses in 191 5 was inade- 

 quate for satisfactory readings, particularly for the darker oils, and the 

 results are merely indicative. 



Table III. — Color of the olive oil 



Series. 



A 

 B 

 C, 

 D 

 E 

 F. 

 G 

 H 

 I. 



A 

 B 

 C. 

 D 

 E 

 F. 

 G 

 H 

 I. 



Conditions of the experiment 



September, 1915. 



Control 



Enzym-free 



Air 



Light 



Moisture 



Air-light 



Air-moisture 



Light-moisture 



Air-light-moistiu-e. . . 



March, 1916. 



Control 



Enzym-free 



Air 



Light 



Moisture 



Air-light 



Air-moisture 



Light-moisture 



Air-light-moisture. . . 



stratum. 



Inches. 



0. 50 



•50 



1. 00 



•50 



•50 



I. 00 



I. 00 



•50 

 I. 00 



25 

 25 

 00 



5° 

 25 

 00 



GO 



50 

 00 



Color developed. 



Orange. Yellow 



I. O 

 I. O 



•5 



I. o 

 I. o 



•3 



•5 



I. o 



•7 



.8 



I. o 



•5 



II. 8 



II. 8 



I. I 



2.7 



II. 8 



I. o 



1.6 



3-4 

 I. o 



