If I remember rightly, he told me that the expedition to which he was attached left Adelaide with the object of going overland to Fremantle.

It was thoroughly well equipped, and for a long time everything went well with the party.

One day, whilst some of them were off exploring on their own account, he lost himself.
He rather thought that the sun must have affected his brain even then, because he didn't try to find his companions that night, but went to sleep quite contentedly under a tree.

He realised the horror of his position keenly enough the next morning, however, and rode mile after mile without halting for food or water, in the hope of quickly regaining his friends at the chief camp.

But night stole down upon him once more, and he was still a lonely wanderer, half delirious with thirst; the supply he had carried with him had long since given out.
Next morning, when he roused himself, he found that his horse had wandered away and got lost.