And as the thought took them all, a silence fell over the multitude. They looked at the struggling man in a new community of idea. Oysters they had seen before, but never an oyster like this. Oysters they knew not as food; but they had always regarded them as rather ineffectual and harmless creatures. Yet this bold oyster was actually giving battle, and on equal terms, to a man! Were oysters henceforth to be added to the number of man's enemies? Were oysters about to attempt to conquer mankind? This oyster, was he the champion of the sea, sent up out of its depths, to grapple with mankind for supremacy? Dimly, vaguely, as they watched the man attempt to pull the oyster ashore, and the oyster attempt to pull the man out to sea, some sense of the importance of this struggle was felt by mankind. Over forest, beach, and ocean hung the sense of momentous things. A haze passed across the face of the bright morning sun; the breeze died down; it was as if all nature held her breath at this struggle. And if mankind upon the land was interested, the sea was no less concerned. For, of sudden, and as if by preconcerted signal, a hundred thousand oysters poked their heads above the surface of the waters and turned their eyes--they had small fiery opalescent eyes in those days--upon the combat. At this appearance, mankind drew back with a gasp, but no word was uttered. The visible universe, perturbed earth and bending heavens alike, was tense and dumb. On their part, the oysters made no attempt to go to the assistance of their champion. Nor did mankind leap to the rescue of Probably Arboreal. Tacitly, each side, in a spirit of fair play, agreed not to interfere; agreed to leave the combat to the champions; agreed to abide by the issue. But while they were stirred and held by the sense of tremendous things impending, neither men nor oysters could be expected to understand definitely what almost infinite things depended upon this battle. There were no Darwins then. Evolution had not yet evolved the individual able to catch her at it. But she was on her way. This very struggle was one of the crucial moments in the history of evolution. There have always been these critical periods when the two highest species in the world were about equal in intelligence, and it was touch and go as to which would survive and carry on the torch, and which species would lose the lead and become subservient. There have always been exact instants when the spirit of progress hesitated as between the forms of life, doubtful as to which one to make its representative.