1626
11. C. SHERMAS AND A . 1%. KROPFF.
to dark red, and on the coniponeiit parts of cor11 (bran, germ and gluten), in all cases gave negative results for added color, tested under like coiiditions with the gluten feeds. The evapvrated steep-ivater often gives a faint color reaction, similar to caramel (sugar) coloring. on the first \vool sample. The artificial coloring of feed-stuli's is contrar!. to the Federal E'ood Act and to many State Food Acts, unless it is specifically stated that the food product is artificially colored. The purpose of adding color to gluten feeds is only for deception, to make thein appear better thaii the!. really are or to hide some inferiorit!.. such as the use of rotten, burnt or fermented corn. The buyers ol gluten feeds are lull!. a\vare that these products cannot be of absolutely uiiiforiii color or sliade, due to variation in color of the raw material used, the corn. I t cannot even be justly claimed that a high artificial color makes leeds more palatable, as it is very doubtful whether the esthetic taste or the idios!.iicrasy of the animals have been sufficientl>- de\-eloped to discriminate between bro\vn, grayish-brown or golden-yellow gluten feeds. I wish to express my thanks to AIessrs. Hills, Jenkins, Jordan, 1-oorhees, LVheeler and LI:oods, Directors oi the \yeriiiont, Connecticut, Ken- 170rk, New Jersey, Rhode Island and Maine I'sperinient Stations, for some of the samples gathered iii their respective states and forwarded to me. Sothing was known to me as to the history or as to the inanufacturers of these samples of gluten feeds, they ivere submitted under identification marks only, P O S T A L TELEGRAPH BUILDING,CHICAGO. [CONTRIBUTIONS FROM
THE HAVEMEYER 1,ABORATORIES OF COLUMBIA USIVERSITY, No. 158.1
THE CALORIFIC POWER OF PETROLEUM OILS AND THE RELATION OF DENSITY TO CALORIFIC POWER. RY H .
c. SHlU
