[May 10th 1916]
we are face to face with that awful human speculation which has baffled every age of man, the perception of the infinite.
During a march of 145 miles over the open desert I observed only two mammals, a Jerboa and a Hedgehog. The former, which I take to be the Euphrates Jerboa (Abacta euphratica), is a very pretty rat-like creature, with soft, silky fur, yellow as the desert sand. Its inconspicuous fore limbs are scarcely seen, but the long hind limbs, four times the length of the front ones, enable it to bound about in agile leaps and dart from point to point with incredible swiftness and dexterity. The hind feet are clothed in thick, hairy pads, I suppose to protect them from the heat of the sands,