Compound Celluloses 



171 



take us too far from the purpose of this discussion to reproduce 

 the scheme in full detail ; it will be sufficiently grasped from the 

 subjoined statement of the complete results of analysis of straw. 



With the aid of the methods of more recent introduction (see 

 p. 261), the group of ' undetermined constituents' of the older 

 analytical schemes may be much more completely resolved ; and 

 these methods, added to those above outlined, afford a scheme of 

 sufficient completeness for all the present requirements of agricul- 

 tural or physiological research. 



We have devoted some space to the consideration of these 

 results, not only on account of the importance of the subject, but as 

 an illustration of the statistical method of inquiry to which chemico- 

 physiological investigations have been largely limited. By the 

 later work on the chemistry of the more complex carbohydrates, 

 the way is opened for direct investigation of the nutritive value of 

 the group of constituents formerly aggregated as N-free extrao 



