356 MISSOURI AGRICULTURAL EXP. STA., RESEARCH BULLETIN NO. IO 



This data is given in Table 6. 



TABLE 6. SPECTROSCOPIC STANDARD OF CAROTIN AND XANTHOPHYLLIS. (FROM 



THE CARROT.) 



It will be noticed that the relative position of the bands of car- 

 otin and xanthophylls is more characteristic in carbon bisulphide 

 than in alcohol. On this account, nearly all subsequent spectro- 

 scopic studies were made in carbon bisulphide solution. 



It will be noticed that both pigments showed three bands. The 

 difference in the color of the carbon bisulphide solutions of the 

 carotin and xanthophyll pigments when showing bands of equal inten- 

 sity is also especially noteworthy. To the eye, the carotin solutions 

 are a deep red orange while the xanthophyll solutions are a much 

 purer orange color. It is worthy of mention that this characteristic 

 difference was so noticeable throughout all this study, that in all 

 cases the color of the carbon bisulphide solution of unknown pig- 

 ments was recorded in connection with the measuring of the absorp- 

 tion bands. 



CHARACTER OF THE PIGMENTS IN DIFFERENT BUTTER FATS. 



It was stated previous to the confirmation of the presence of 

 secondary xanthophyll-like pigments in the particular butter fat 

 studied, that if the presence of these pigments could be confirmed 

 it would necessary to establish such a fact as either characteristic 

 of all butter fat or as incidental only to the particular fat studied. 



