358 DISEASES OF METABOLISM 



elements lacking. Parrots and canaries are difficult to relieve 

 from the habit. Change in the food, with plenty of green 

 materials will often help. Examine them carefully to be 

 sure they are free from lice, or other parasites. Bitter solu- 

 tions applied to the feathers may stop it. Feather eating 

 is difficult to control, but change of food as described above, 

 and the administration of small doses of apomorphin hydro- 

 chlorid (0.0005-0.001) have proved to be of value in a number 

 of cases. 



