reasons endorsed every measure of caution which Lord John's experience could suggest. Yet it was surely impossible that we should halt on the edge of this world of mystery when our very souls were tingling with impatience to push forward and to pluck the heart from it.
We therefore blocked the entrance to our zareba by filling it up with several thorny bushes, and left our camp with the stores entirely surrounded by this protecting hedge. We then slowly and cautiously set forth into the unknown, following the course of the little stream which flowed from our spring, as it should always serve us as a guide on our return.
Hardly had we started when we came across signs that there were indeed wonders awaiting us. After a few hundred yards of thick forest, containing many trees which were quite unknown to me, but which Summerlee, who was the botanist of the party, recognized as forms of conifera and of cycadaceous plants which have long passed away in the world below, we entered a region where the stream widened out and formed a considerable bog. High reeds of a peculiar type grew thickly before us, which were pronounced to be equisetacea, or mare's-tails, with tree-ferns scattered amongst them, all of them swaying in a brisk wind. Suddenly Lord John, who was walking first, halted with uplifted hand.
"Look at this!" said he. "By George, this must be the trail of the father of all birds!"
