124 Percentage Composition of Milk 



6. It is suggested that the quantity of lactose elaborated hy the 

 uiainmary gland controls the daily volume of the milk, and that, there- 

 fore, the rate of its elaboration controls the rate of milk secretion. 



We wish to express our indebtedness to Dr .1. B. Orr, who suggested 

 this research, for constant encouragement and advice during the progress 

 of the work. 



KF.I'i:i!KX(i:.s. 



(1) VoiT. Zeilschnjl far B'whijk, 1 8(19, 5, p. 122. 



(2) Ingle. Bull. Yorks. Coll., Leeds, No. 2.'). Mtdl. Cited by Hainnioml and Hawk, 



Joiirii. A(inr. Sci., 1917, 8, p. 139. 

 (:i) C'rowther. Univ. of Leeds, Bull. Xo. 44, 1903. Cited by Hammond and Hawk, 

 ./onni. Agric. Sci., 1917, 8, p. 139. 



(4) Jordan and Jenter. New York Agric. Kxper. Station. 1901. Bull. No. 197. 



Cited by Lusk, The Science of NiUrition, 1917, p. 393. 



(5) Morgan, Beroer and Fincjerling. LandwirUchaJt. Venuchaatal, 1904, 41, 



p. 1. Cited by Lusk, The Science of Nutrition, p. 393. 

 ((!) Hammond and Hawk. Studies in Milk Scciction. .Jottrn. of Aqric. Sci.. 1917, 

 8. J). 139. 



(7) TooHER. Investigation into. Milk Yield of .Ayrshire Cows. Trans. High.and Agric. 



Soc. of Scot., 1919, 31, p. 237. 



(8) Crowther and Ruston. Variation in the Composition of Cows' Milk witb the 



Advance of Lactation. Trans. High, and Agric. Soc. of Scot , 191 1. 23. p. 93. 



(9) Van der Laan. Biochein. Zeil.tch., 1919. 73. p. 313-2.5. 



{Received 6 January 1922.) 



