WANDERINGS IN SOUTH AMERICA 141 



hair brush, and give the inside of both mandibles 

 a coat ; apply a second when the first is dry, then 

 another, and a fourth to finish all. The gum- 

 arabic will prevent the chalk from cracking and 

 falling off. If you remember, there is a little space 

 of transparent white in the lower mandible, which 

 originally appeared blue, but which became trans- 

 parent white as soon as the thin piece of blue skin 

 was cut away; this must be painted blue inside. 

 When all this is completed, the bill will please 

 you ; it will appear in its original colours. Prob- 

 ably your own abilities will suggest a cleverer 

 mode of operating than the one here described. 

 A small gouge would assist the penknife, and ren- 

 der the operation less difficult. 



