FEEDING OF ANIMALS. 271 



percentage, and so on ; and as the ad libitum food always 

 supplied much the larger proportion of the total ration, 

 the animals fixed their own consumption, according to the 

 composition of the foods, and to their own requirements, 

 including those both for respiration and maintenance, and 

 for increase. 



The foods of high percentage of nitrogen consisted in most Foods 

 cases of an equal mixture of bean and lentil meal — that is, of tr%ed " 

 highly nitrogenous leguminous seeds — and those of low per- 

 centage were, in most cases, either maize-meal or barley-meal. 

 In some, however, either pure starch or pure sugar was given. 

 The details of the foods, the weights and increase of the 

 animals, and of the amounts of the various foods, and of their 

 nitrogenous and non-nitrogenous constituents consumed, per 

 100 lb. live-weight per week, and to produce 100 lb. of in- 

 crease in live-weight, have been given and fully discussed in 

 various papers. 1 



The conclusion drawn from the results of the various ex- Conclu- 

 periments with pigs was that in their case, as in that with s ^ on 

 sheep, it was the supplies in the food of the available non- from pig 

 nitrogenous, or total organic constituents, rather than those tnals - 

 of the available nitrogenous substance, that regulated the 

 amount consumed, both by a given live -weight within a 

 given time, and to produce a given amount of increase. 

 The point is, however, even more clearly brought to view by 

 the graphic representation of the results given in the coloured Coloured 

 diagrams following p. 354. diagrams. 



In explanation of them it may be stated, that nitrogenous 

 substance is represented by black, non-nitrogenous by yellow, 

 and total organic substance by red. Diagram I. illustrates 

 the relative amounts of the respective constituents consumed 

 per 100 lb. live- weight per week, and Diagram II. the amounts 

 consumed to produce 100 lb. increase in live-weight. Each of 

 the thirty columns represents the results of a separate experi- 

 ment or pen. 



The first nine columns show the results of experiments 

 1-8, and 12, of Series 1 ; the next twelve those of the twelve 

 experiments of Series 2 ; the next five those of the five ex- 

 periments of Series 3 ; and the last four those of the four 

 experiments of Series 4. It may be added that there were 

 three pigs in each pen of Series 1, 2, and 4, and four in each 

 pen of Series 3. 



The plan of the diagrams in other respects will be best 

 understood by giving an example. Take, for instance, the 



1 " On the Composition of Foods in relation to Respiration and the Feed- 

 ing of Animals" (Rep. Brit. Ass. for 1852). "Pig-Feeding" (Jour. Roy. 

 Ag. Soc. Eng., vol. xiv. p. 459, 1853). 



