474 
Journal of Agricultural Research 
Vol. XXX, No. 5 
Some fresh carrots were sliced and 
some were ground. Carotin decom¬ 
position was much greater in the 
ground carrots owing perhaps to the 
greater mechanical injury to the 
tissues in the grinding process, greater 
exposure of the material to oxygen, 
and slower drying. Incomplete ex¬ 
traction and losses in the crystalliza¬ 
tions are further responsible for the 
low yield obtained. 
SUMMAKY 
(1) The solubility of carotin at 25° C. 
in absolute alcohol was found to be 15.5 
mgm. per liter: in petroleum ether (B. 
P. 30 to 50° -C.), 626 mgm. per liter; 
in specially purified ethyl ether, 1,005 
mgm. per liter. 
(2) Solutions of carotin in absolute 
alcohol and petroleum ether were found 
to be extremely stable when kept in the 
ice box. An ether solution of carotin 
decomposed rapidly though stored in 
the. ice box. The decomposition may 
have been caused by peroxides in the 
ether. 
(3) Crystals of carotin may be stored 
in alcohol or petroleum ether for some 
time with only slight oxidation even 
though the container is not sealed, and 
may be stored permanently in these 
solvents if sealed in ampules. 
(4) The method for the preparation 
of pure carotin from carrots on a small 
scale is described. 
(5) A bushel of carrots (50 pounds) 
which contained 3.46 gm. of carotin 
colorimetrically when fresh, and 2.81 
gm. of carotin colorimetrically when 
pulverized for extraction, yielded 1.13 
gm. of pure carotin (M. P. 174°). 
LITER AT DEE CITED 
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1922. THE AUTOXIDATION OF ETHYL ETHEE. 
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1909. ZUB KENNTNIS DES CABOTINS UND DES 
lycopins. 102 p., illus. Zurich. 
(3) Kohl, F. G. 
1902. UNTEBSUCHUNGEN tjBEE DAS CABOTIN UND 
SEINE PHYSIOLOGISCHE BEDEUTUNG IN DEB 
pflanze. 206 p., illus. Leipzig. 
(4) Pabsons, L. W., and Wilson, R. E. 
1922. A NEW METHOD OF COLOB MEASUBEMENT 
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269-278, illus. 
(5) Pbiest, I. G. 
1920. THE COLOB OF SOYA BEAN OIL AS COMPABED 
WITH THAT OF COTTONSEED OIL. Cotton Oil 
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(6) SCHEBTZ, F. M. 
1924. THE QUANTITATIVE DETEBMINATION OF 
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(7) WiLLSTiTTEB, R. M., and Mieg, W. 
1907. UNTEBSUCHUNGEN tjBEB CHLOEOPHYLL. IV. 
UEBEB DEN GELBEN BEQLEITEN DES CHLOBO- 
fhylls. Liebig’s Ann. Chem. 355 :1-28. 
(8) —-and Stoll, A. 
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