What, May? You did not see any spines?

Look again.

See, Charlie has drawn them very plainly in his picture of the grasshopper's leg. Mark them s, Charlie.

Now we must all look at Charlie's picture.

He says he thinks he knows what the spines are for—they are to keep the grasshopper from slipping when he makes his leap forward.

I have no doubt Charlie is right.

May wants us to look at the beautiful little hinge x where the femur and the tibia are fastened together.

Let us mark it X.