CAROTIN THE PRINCIPAL NATURAL YELLOW PIGMENT OF 



MILK FAT. 



Its Relations to Plant Carotin and the Carotin of the Blood Serum, 

 Body Fat and Corpus Luteum. 



LEROY S. PALMER AND C. H. ECKLES. 



The investigations dealing with the natural yellow pigment of 

 milk fat will appear as a series of four bulletins as follows : 



Part. I. A Review of the Literature Concerning the Yellow Plant 

 and Animal Pigments. Missouri Agricultural Experiment 

 Station Research Bulletin No. 9. 



Part II. The Chemical and Physiological Relation of the Pigments 

 of Milk Fat to the Carotin and Xanthophylls of Green Plants. 

 Missouri Agricultural Experiment Station Research Bulletin 

 No. 10. 



Part. III. The Pigments of the Body Fat, Corpus Luteum and 

 Skin Secretions of the Cow. Missouri Agricultural Experi- 

 ment Station Research Bulletin No. n. 



Part IV. (A). The Yellow Lipochrome of Blood Serum. (B.) 

 The Fate of Plant Carotin and Xanthophylls During Diges- 

 tion. (C). The Pigments of Human Milk Fat. Missouri Ag- 

 ricultural Experiment Station Research Bulletin No. 12. 

 The present paper is the first of the series. As indicated it will 

 "be confined entirely to a review of the extensive literature in regard 

 to the yellow plant and animal pigments. 



Part II will be a report of the chemical identification of the milk 

 fat pigment. It will also include a number of investigations showing 

 the relation between the amount of pigment in the milk fat and the 

 character of the ration and the breed of the cow. 



Part III will consist of the data showing the chemical identification 

 of the pigments mentioned. Data will also be presented showing the 

 relation between the color of the body fat and the character of the 



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