22 



SCIENCE BULLETIN, No. 12. 



The investigation seems to indicate that it is the absolute shortage in 

 lime, potash, and phosphoric acid to the cow which causes areas Al, A2, Bl, 

 and B2 to induce bone-chewing, and explains the absence of the disease on 

 areas represented by Cl and C2. 



TABLE XIII. 



ASSUMING that 56 Ib. of the grasses from Bega district are fed to cows, the 

 animals would receive the undermentioned amounts of mineral matter: 



Bones. 



Samples of the bones of animals reared on affected and unaffected areas 

 have been submitted from time to time, and the mean of the results of the 

 analyses are given in the following table: 



TABLE XIV. 

 BONES from Affected and Unaffected Areas (average of analyses). 



It is o'f interest to note that bones from affected areas contain, less lime 

 and less phosphoric acid than do bones from non-affected areas. 



