More difficult to conceive the political activity which pervades the United States than the freedom and equality which reign there - The great activity which perpetually agitates the legislative bodies is only an episode to the general activity - Difficult for an American to confine himself to his own business - Political agitation extends to all social intercourse - Commercial activity of the Americans partly attributable to this cause - Indirect advantages which society derives from a democratic government.英文原著 · 《Democracy In America-1》
But the most thorough investigation of a radio-active pedigree is found in Rutherford's classical researches on the successive disintegration products of radium, in order to follow the evidence on which his results are founded, we must describe more fully the process of decay of the activity of a simple radio-active substance. The decay of activity of the body known as uranium-X is shown in a falling curve (Fig. It will be seen that, in each successive 22 days, the activity falls to half the value it possessed at the beginning.英文原著 · 《Darwin and Modern Science》
We have already interpreted pain as a phenomenon of motor activity. When pain does not lead to muscular activity it therefore frequently leads to crying or to moaning, just as tickling, which is equally an incentive to motor activity, results in laughter if it does not find full expression in action.英文原著 · 《The Origin and Nature of Emotions》
One, two, three, four--five pats of butter right in front of you! And you inquire--!"
Artois suddenly sent out a loud roar to join her childish treble. The tea had swept away his previous sensation of fatigue, even the happy stolidity that had succeeded it for an instant. He felt full of life and gayety, and a challenging mental activity. A similar challenging activity, he thought, shone in the eyes of the girl opposite to him. "Thank God I can still be foolish!" he exclaimed. "And thank God that there are people in the world devoid of humor. My German friend was without humor.英文原著 · 《A Spirit in Prison》
It was soon discovered that the activity of uranium compounds was proportional to the amount of uranium present in them. Thus radio-activity is an atomic property dependent on the amount of an element and independent of its state of chemical combination.英文原著 · 《Darwin and Modern Science》
The transmutation theory of radio-activity was formulated by Rutherford (Rutherford, "Radio-activity" (2nd edition), Cambridge, 1905, page 307.) and Soddy in 1903. By its light, all recent work on the subject has been guided; it has stood the supreme test of a hypothesis, and shown power to suggest new investigations and to co-ordinate and explain them, when carried out. We have summarised the evidence which led to the conception of the theory; we have now to consider the progress which has been made in tracing the successive disintegration of radio-active atoms.英文原著 · 《Darwin and Modern Science》