According to his recorded observation, the herd extended along the river for a distance of 25 miles, which was in reality the width of the vast procession that was moving north, and back from the road as far as the eye could reach, on both sides. It is making a low estimate to consider the extent of the visible ground at 1 mile on either side. This gives a strip of country 2 miles wide by 25 long, or a total of 50 square miles covered with buffalo, averaging from fifteen to twenty to the acre.[23] Taking the lesser number, in order to be below the truth rather than above it, we find that the number actually seen on that day by Colonel Dodge was in the neighborhood of 480,000, not counting the additional number taken in at the view from the top of Pawnee Rock, which, if added, would easily bring the total up to a round half million! [Note 23: On the plains of Dakota, the Rev. Mr. Belcourt (Schoolcraft's N. A. Indians, IV, p. 108) once counted two hundred and twenty-eight buffaloes, a part of a great herd, feeding on a single acre of ground. This of course was an unusual occurrence with buffaloes not stampeding, but practically at rest. It is quite possible also that the extent of the ground may have been underestimated.] If the advancing multitude had been at all points 50 miles in length (as it was known to have been in some places at least) by 25 miles in width, and still averaged fifteen head to the acre of ground, it would have contained the enormous number of 12,000,000 head. But, judging from the general principles governing such migrations, it is almost certain that the moving mass advanced in the shape of a wedge, which would make it necessary to deduct about two-third from the grand total, which would leave 4,000,000 as our estimate of the actual number of buffaloes in this great herd, which I believe is more likely to be below the truth than above it. No wonder that the men of the West of those days, both white and red, thought it would be impossible to exterminate such a mighty multitude. The Indians of some tribes believed that the buffaloes issued from the earth continually, and that the supply was necessarily inexhaustible. And yet, in four short years the southern herd was almost totally annihilated. With such a lesson before our eyes, confirmed in every detail by living testimony, who will dare to say that there will be an elk, moose, caribou, mountain sheep, mountain goat, antelope, or black-tail deer left alive in the United States in a wild state fifty years from this date, ay, or even twenty-five? Mr. William Blackmore contributes the following testimony to the abundance of buffalo in Kansas:[24] [Note 24: Plains of the Great West, p. xvi.]