190 PLANT PRODUCTS 



are not of great importance, because the percentage of crude 

 fibre in this meal is very small. The fluctuations in the 

 digestibility of the crude fibre in undecorticated cotton cake, 

 which vary from 2 to 24 per cent., although superficially 

 not so serious, are in practice of more importance, since 

 the percentage of fibre in this food is about 20 per cent. 

 In spite, however, of these apparently large discrepancies, 

 experience has shown that feeding standards which are 

 based ultimately on these experiments are practically 

 sound. 



During digestion, the lining of the stomach itself is 

 protected by a supply of anti-pepsin, which is produced 

 for this purpose. If an animal were to die suddenly during 

 the process of digestion, the supply of this anti-pepsin would 

 fail along with the rest of the circulation, and the lining of 

 the stomach would be partly digested by the digestive 

 juices. Some portion of the materials which are considered 

 as not having been digested are really bacterial remains, 

 which, of course, have been produced from the food by the 

 life of bacteria, and have done no good to the animal. 



REFERENCES TO SECTION II 



V^anklyn, " Water Analysis." (Kegan Paul.) 

 Evans, "Driage," Agric. Journ. India, 1917, p. 234. 

 Leathes, " The Fats. Monograph on Biochemistry." (Longmans.) 

 Collins, " The Feeding of Linseed to Calves," Journ. Board of Agricul- 

 ture. 1915-16, p. 120. 



Bainbridge, Collins, and Menzies, " Experiments on the Kidneys of the 

 Frog," Proc. Roy. Soc, B., vol. 86, 1013. 



Plimmer, " The Chemical Constitution of the Proteins. Monograph of 

 Biochemistry. (Longmans.) 



Armstrong, " The Simple Carbohydrates." (Longmans.) 

 A. Rendall Short, " The New Physiology," p. 84. (Simpkin.) 

 Kellner, " The Scientific Feeding of Animals," p. 379. (Duckworth.) 

 Warington, " Chemistry of the Farm," p. 144. (Vinton.) 



