They were sulphur crests.

You'll see thousands in the groves down by the river." "Is there a river about here ?" "Your wet clothes seemed to suggest something of the kind," said the doctor, laughing.
"But that was a pond," said Nic.
"A water-hole--a deep place in the river.

That depression is a river, Nic," continued the doctor, pointing; "there it runs yonder.

You can trace it by the trees which cluster along its course.

It is dried up now, all but a hole here and there; but after rains it is a rushing stream, and I dare say a little water is always trickling along its course from hole to hole a few feet under ground.