should like to know what animal this belonged to?"
The Professor examined the bones critically, without venturing an opinion. "What is this?" were his first words. Directly behind the ear cavity was a split or broken cleavage in which they found a round piece of dark wood.
"Get the bolo, George; we may find something interesting here." With a few strokes the skull was opened, and embedded within the brain receptacle was an arrow.
"This animal was, as you see, killed by the inhabitants of the island. I infer that there are several tribes living here."
The boys looked at each other in astonishment.
"Why do you think so?"
"This arrow is different in shape and in structure from the sample we found this morning."
The boys now noticed the difference.
"Do different tribes make their implements differently?"
"There is just as much difference among savages in the way they make their weapons and different implements, as among civilized people. Our customs differ; our manufactured articles are not the same; and sometimes the manner of using the tools is unlike; and the divergence is frequently so wide that it has been difficult in many cases to trace the causes and explain the reasons. Such an instance may be found in the Chinese way of holding a saw, with the teeth projecting from the sawyer. For years all tools and machinery made in England could be instantly recognized by those versed in manufacturing, on account of the bulk, as the