28 Mr. Henry Walker's Lecture: recreation. The hunting fields around us in Essex, Middle- sex, and Surrey are changed indeed since elephants and aurochs roamed wild along the valley of the Thames; but the hunting impulse still remains. Huge bisons and huger mammoths are now no longer slain between the eyes with the well-aimed flint-stone, as once they were in more arboreal times; but we, the hunters of to-day, still track the giant pachyderms and oxen to their home. In old and well-stocked zoological preserves we well know where to find them, and spoil them, like our ancestors, of horns, and tusks, and teeth, as perchance we shall to-day. Our trysting place, this Saturday of June, has a name that sounds anachronistic in narratives of mammoth hunting in the valley of the Thames. We meet in Bishopsgate. The railway of these late Post-Pliocene times will take us to these well-stocked zoological preserves of which we speak. Ilford, in Essex (only seven miles from the Royal Exchange), is the spot at which we know our game is likely to be found. But who are we, the hunters, who assemble in such force at this rendezvous in Bishops- gate to day ? A goodly fellowship of London naturalists crowds the railway platform. We meet with veteran geologists as well as amateurs—the fellow-workers once with Buckland, and De la Beche, and Sedgwick—with men Who know the birth-rock of each pebble so round, And how far its tour has extended, —men who willingly lend themselves to teach and popu- larise their fascinating science. How many Londoners are really addicted to exploring the ancient geography of their favourite City and its environs only appears on a great occasion. The discovery of an old deserted bed of the Thames, with elephant and rhinoceros remains; the finding of a chipped flint hatchet, used by our rude Palaeolithic fore- fathers ; a new revelation of the Glacial Drift at Finchley ; a fresh "section" in the submerged forest-bed of Plum- stead or Walthamstow—such incidents bring out the eager- host, the old and young alike, in all their glory. Here