Our most valuable successes usually are achieved on the principle followed by this dog:
In his “Introduction to Comparative Psychology” (1894), Dr. Lloyd Morgan told the story of his dog’s attempts to bring a hooked walking-stick through a narrow gap in a fence. The dog “tried” all possible methods of pulling the stick through the fence. Most of the attempts showed themselves to be “errors.” But the dog tried again and again, until he finally succeeded. He worked by the method of trial and error. (Text.)
(998)
We doubt many theories that are recorded by others, but when we see them proved for ourselves we doubt no longer. A writer, after describing Franklin’s first disappointment in investigating the action of oil on water, records his later experiments:
Franklin investigated the subject, and the results of his experiments, made upon a pond on Clapham Common, were communicated to the Royal Society. He states that, after dropping a little oil on the water, “I saw it spread itself with surprizing swiftness upon the surface, but the effect of smoothing the waves was not produced; for I had applied it first upon the leeward side of the pond, where the waves were largest, and the wind drove my oil back upon the shore. I then went to the windward side, where they began to form; and there the oil, tho not more than a teaspoonful, produced an instant calm over a space several yards square, which spread amazingly, and extended itself gradually till it reached the lee side, making all that quarter of the pond (perhaps half an acre) as smooth as a looking-glass.”
(999)
About all of the great enterprises of mankind are built on earlier experiments that seemed to fail. Hiram Maxim and S. P. Langley each spent laborious years constructing flying-machines that would not fly. Yet those who later succeeded made use of all the important devices that these earlier experimenters had invented.
Some years since it was seen that by damming, controlling, and releasing the waters of the Colorado River in southern California and Mexico a vast tract of land, which was hot, arid, and uninhabitable, might become a fertile valley, giving homes and sustenance to millions. The opportunity was great, the power to be controlled and regulated was as great as the opportunity, but a failure came in the mind and executive ability of the men who were drawn to this great task. The waters escaped their control, and, where they intended to irrigate flowering gardens and fruitful plantations, they let loose a devastating flood, which burst all barriers, and threatened to establish in place of the desert an inland sea. In time the intellect of man solved the problem, met the opportunity with due achievement, and now the original promise is in the way of fulfilment. (Text.)