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But the human mind; that is a different matter. Here is something which, intangible in itself, seems incapable of dissection or of objective experimentation, in the ordinary sense of the word. Yet that is what present-day normal and abnormal psychology has been enabled to do!
Errors have been made in conducting the work at Maine which have made it possible for a mathematical biologist to take the data and seemingly prove that selection, as practiced by Professor Gowell, actually resulted in lowering inherent egg capacity of the strain of Plymouth Rock hens under experimentation.
As preparation for problem 2, a break in regular experimentation covering four days followed the control series of problem 1. On each of these four days the monkey was allowed to get food once from each of the nine boxes, both doors of a given box being open for the trial and all other doors closed.
Edison, with characteristic thoroughness, took up a line of investigation, and after a prolonged series of experiments succeeded in inventing a mixture that upon hardening remained uniform throughout its mass. In the beginning of his experimentation he had made the conditions of test very severe by the construction of forms similar to that shown in the sketch below.
The key was in the lock, and a few moments of investigation and experimentation were rewarded with the successful opening of the receptacle. In it he found a faded photograph of a smooth faced young man, a golden locket studded with diamonds, linked to a small gold chain, a few letters and a small book. Tarzan examined these all minutely.
And hence it is that the Method of Agreement, though applicable in principle to either case, is more emphatically the method of investigation on those subjects where artificial experimentation is impossible; because on those it is, generally, our only resource of a directly inductive nature; while, in the phenomena which we can produce at pleasure, the Method of Difference generally affords a more efficacious process, which will ascertain causes as well as mere laws.
His experimentation helps develop not only new procedures, but new concepts relative to the general nature of hypnosis and its many ramifications. I was interested to see what would happen to a subject if he thought he was deeply hypnotized without ever giving him verbal suggestions or reassurance that he would feel better or overcome his problem.
Certain of these problems could be partially solved by laboratory experimentation, but nothing can replace flight testing, and the results obtained by flight tests in our atmosphere would not be valid in another type of atmosphere.
On other scouts the boy had proved to have a keen eye for the country and a liking for experimentation which was not a universal attribute even among those of his own age. "I would go to find a path through the mountains; it may be a long trail," Travis half protested. "You believe what you seek may lie to the north?" Travis shrugged. "I do not know.
It would be impossible to give here any just idea of the vast amount of rigid scientific experimentation which has been carried on in this field, or the certainty of many of the results. Sex is really known, about as well as anything can be known, to arise from the chemical causes discussed above. That is, the endocrine explanation is the correct one.
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