12 CONTENTS 



PAGE 



CHAPTER VI. Clu-mical Relations between Plant and Animal 



Carotinoids 173 



Egg yolk xunthophyll. Corpus luteum carotin. Crustacean 

 carotin. 



CHAPTER VII. Biological Relations between Plant and Animal 



Carotinoids 182 



Earlier views for and against a biological relationship. -Iso- 

 lated facts supporting a biological relationship. Experi- 

 ments proving a biological relationship. Insects. Cattle. 

 Fowls. Man. Distributions of carotinoids among different 

 species. 



CHAPTER VIII. Methods of Isolation of Carotinoids . . . 199 



Isolation of carotin. From carrot?. From green leaves. 

 From animal fat. From blood serum. Isolation of xan- 

 thophylls. From green leaves. From egg yolk. From 

 blood serum. Isolation of lycopin. Isolation of fucoxan- 

 thin. Isolation of rhodoxanthin. 



CHAPTER IX. General Properties and Methods of Identification 



of Carotinoids 218 



Properties of carotinoid solutions. Carotin. Lycopin. 

 Xanthophylls. - - Rhodoxanthin. - - Fucoxanthin. - -Proper- 

 ties of crystalline carotinoids. Carotin. Other pigmented 

 hydrocarbons. - - Xanthophyll. - Lycopin. - - Fucoxanthin. 

 Methods of identification in biological products. Plant 

 tissues. Animal tissues. 



CHAPTER X. Quantitative Estimation of Carotinoids . . . 248 



Estimation of carotin and xanthophyll. Method of Arnaud. 



Arnaud's results. Method of Monteverde and Lubimenko. 



Monteverde's results. Methods of Willstatter and Stoll. 

 Results by Willstatter and Stoll's method. Estimation of 

 fucoxanthin. Application to other biological materials. 



CHAPTER XL Function of Carotinoids. in Plants and Animals . 262 



Possible function in plants. Possible function in animals. 

 Possible relations to vitamins. Relation between yellow pig- 

 mentation and fowls and egg laying. Possible relation be- 

 tween yellow pigmentation of cattle and milk secretion. 



Bibliography 279 



Index to Authors 296 



Index to Subjects 300 



