215 



therefore come to be more generally used for pig and 

 cattle feeding, it is desirable that more attention should 

 be paid to this subject. 



" The dry solid matter of potato tubers has an average 

 composition as follows : 



Starch ... u ... ... ... ... 82'2 



Albuminoids ..." ... ... ... ... 10-1 



Fat ... ... ... ... ... ... -5 



Fibre ... ... ... ... ... ... 27 



Ash ... ... ... 4-5 



100-0 



" The specific gravity of these compounds is only 

 approximately known. Their respective percentages 

 vary in different tubers, and only an approximate de- 

 duction of the weight of contained dry material can 

 therefore be made from observed specific gravities of 

 tubers. From a number of determinations of dry 

 material made by the Warminster investigators, it 

 appears that the mean specific gravity of the solids 

 is near 1*600, and the table given is made by the 

 adoption of the following formula : 



1-600 X 100 [(sp. gr. tubers X 1000) 1000] 

 (1-6001) (sp. gr. tubers X 1000). 



e.g., in the case of Tmperator the percentage by 

 weight of dry constituents will be : 



160 X 115^27-5 

 6(1115) 



" The values so arrived at are given in the column 

 of the table headed * Calculated Dry Constituents per 



