LANDSCAPE PAINTING
were subjected to a process of selection and elimination, it was finally discovered that there were practically but two instants in the stride of the galloping horse that conveyed any idea of rapid flight to the human eye. The first of these was at the very beginning of the stride, when, with all four legs bunched together under the belly, the animal was preparing for the forward leap; and the second was at the end of the impulse, when, with legs outstretched to the limit, the horse was ready to take the ground again for another stride. Both of these periods, it will be seen, were the instants of arrest of motion—instants when the human eye could readily seize the action without the intervention of the kodak. Then at last was perceived the fundamental law which underlay the phenomenon: the human eye, and the hu-
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