184 PRINCIPLES OF ANIMAL NUTRITION. 
yielding furfural, presumably pentosans, as appears from the follow- 
ing modified form of the last table: 
Total Varbok pcrsts Paimyalent Total Fat 
Equivalent 
of Gain, 
Pentosans, | Other Substances, Grms. 
Grms. Grms. 
ie Ae 
"Tixirantedl straw, period ee 809 1616 613 
Starch, BA isesesevess —34 1729, 395 
Ox J: 
Extracted straw, period 5-4 00... 834 1500 509 
Starch, So aereerte —89 1459 284 
If we regard the furfuroids as not contributing to the fat pro- 
duction, then we must assign to the other nutrients of the extracted 
straw a value from 66 to 74 per cent. greater than that of the 
digested matter of the starch, a result which is hardly conceivable. 
Apparently we must admit that the furfuroids in this case pro- 
duced approximately the same effect as the other non-nitrogenous 
nutrients and were at least indirectly if not directly a source of fat. 
