APPENDIX 359 



be measured without likelihood of a small error. 

 The calculation may, in fact, be made with crude 

 protein, if the feeding-stuffs composing the ration 

 are not very rich in amides. Generally the cheapest 

 amongst the foods which will serve to supplement the 

 ration is chosen, and it is best to regard the market 

 price in doing this, for the nutritive values of foods, 

 as given in tables, are the average for whole countries 

 at some particular time, and may not apply when 

 the ration is being made up. In no case, though, 

 are the standards in Table III to be treated as 

 cast-iron ; they are meant to enable the feeder to 

 start with a well-tried average ration, and then he 

 should find out what is most suitable for his own 

 requirements. 



