Darwin's proposition that, 'many animal forms of life have been utterly lost, through which the early progenitors of birds were formerly connected with the early progenitors of the other vertebrate classes,' from the region of hypothesis to that of demonstrable fact.") The general appearance of the copy which you have sent me is worthy of its contents, and I can say nothing stronger than this.英文原著 · 《The Life and Letters-2》
To have been born of people of integrity and profound faith in God, is better than to have inherited material wealth of any kind. And to those serious-minded, reticent progenitors of mine, looking out from their lonely fields across the lonelier sea, their faith must have been everything.英文原著 · 《A New England Girlhood》
"Err shall they not, who resolute explore Time's gloomy backward with judicious eyes; And scanning right the practices of yore, Shall deem our hoar progenitors unwise.英文原著 · 《Anecdotes of the late Samuel Johnson》
Darwin next discusses the question as to the manner in which man attained to the erect position from the state of a climbing quadruped. Here again he puts the influence of Natural Selection in the first rank. The immediate progenitors of man had to maintain a struggle for existence in which success was to the more intelligent, and to those with social instincts. The hand of these climbing ancestors, which had little skill and served mainly for locomotion, could only undergo further development when some early member of the Primate series came to live more on the ground and less among trees.英文原著 · 《Darwin and Modern Science》
"The leading facts in embryology, which are second to none in importance, are explained on the principle of variations in the many descendants from some one ancient progenitor, having appeared at a not very early period of life, and having been inherited at a corresponding period." ("Origin of Species" (6th edition), page 396.)英文原著 · 《Darwin and Modern Science》
"In the class of mammals the steps are not difficult to conceive which led from the ancient Monotremata to the ancient Marsupials; and from these to the early progenitors of the placental mammals. We may thus ascend to the Lemuridae; and the interval is not very wide from these to the Simiadae. The Simiadae then branched off into two great stems, the New World and Old World monkeys; and from the latter, at a remote period, Man, the wonder and glory of the Universe, proceeded." ("Descent of Man" (Popular Edition), page 255.)英文原著 · 《Darwin and Modern Science》
There's an abnormally healthy population of hematopoietic progenitor stem cells.美剧 · 《The Good Doctor》