EXCURSION TO MAUHES AND ITS NEIGHBORHOOD. 321 
to this. They are free from one great source of degener- 
ation of type. It is to be hoped that Major Coutinho, who, 
while making his explorations as an engineer on the Ama- 
zonian rivers, has also made a careful study of the tribes 
living along their margins, will one day publish the result 
of his investigations. It is to him we owe the greater 
part of the information we have collected on this subject. 
14* 
