Digestibility — How Determined 141 



be added to the coefficients of digestibility of the pro- 

 tein of coarse fodders as usually given in the tables that 

 have been compiled. 



Errors are caused in determination of the digesti- 

 bility of fat in much the same way. Certain of the bile 

 residues in the solid excrement are soluble in the ether 

 which is used to extract the fats, and consequently the 

 undigested fat appears to be larger than it really is. 



