It would be equally rash to assert that characters now increased to their utmost limit, could not, after remaining fixed for many centuries, again vary under new conditions of life.
— from The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition by Charles Darwin

In plants under culture and placed under new conditions of life, sometimes the male organs and sometimes the female organs become more or less impotent; now if we suppose this to occur in ever so slight a degree under nature, then, as pollen is already carried regularly from flower to flower, and as a more complete separation of the sexes of our plant would be advantageous on the principle of the division of labour, individuals with this tendency more and more increased, would be continually favoured or selected, until at last a complete separation of the sexes might be effected.
— from The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition by Charles Darwin

But structures thus indirectly gained, although at first of no advantage to a species, may subsequently have been taken advantage of by its modified descendants, under new conditions of life and newly acquired habits.
— from The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition by Charles Darwin

We have seen that a species under new conditions of life may change its habits, or it may have diversified habits, with some very unlike those of its nearest congeners.
— from The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition by Charles Darwin

But even such structures have often, as we may feel assured, been subsequently taken advantage of, and still further modified, for the good of species under new conditions of life.
— from The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition by Charles Darwin

In plants under culture and placed under new conditions of life, sometimes the male organs and sometimes the female organs become more or less impotent; now if we suppose this to occur in ever so slight a degree under nature, then as pollen is already carried regularly from flower to flower, and as a more complete separation of the sexes of our plant would be advantageous on the principle of the division of labour, individuals with this tendency more and more increased, would be continually favoured or selected, until at last a complete separation of the sexes would be effected.
— from On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life by Charles Darwin

Moreover when a modification of structure has primarily arisen from the above or other unknown causes, it may at first have been of no advantage to the species, but may subsequently have been taken advantage of by the descendants of the species under new conditions of life and with newly acquired habits.
— from On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life by Charles Darwin

We have seen that a species may under new conditions of life change its habits, or have diversified habits, with some habits very unlike those of its nearest congeners.
— from On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life by Charles Darwin

These three great divisions of the higher Martians had been forced into a mighty alliance as the drying up of the Martian seas had compelled them to seek the comparatively few and always diminishing fertile areas, and to defend themselves, under new conditions of life, against the wild hordes of green men.
— from A Princess of Mars by Edgar Rice Burroughs

The policy of the indeterminate sentence is that the delinquent shall be supervised and guided and his capacity to lead an honest and useful life tested by actual experience under normal conditions of living for a period of years long enough to try 42 out his capacity to readjust himself to a life of freedom in society.
— from The Journal of Prison Discipline and Philanthropy 1919 (New Series, No. 58) by Pennsylvania Prison Society

Man by his culture can never directly produce a new organic form, but he can breed organisms under new conditions of life, which are such as to influence and transform them.
— from The History of Creation, Vol. 1 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes by Ernst Haeckel

Our author adds that other cases, similar to those already detailed, might be cited, and he proceeds to show, by several examples, that the waters of other lakes in the same regions, where the valleys had always been bare of wood, or where the forests had not been disturbed, had undergone no change of level.
— from The Earth as Modified by Human Action by George P. (George Perkins) Marsh

20 When rabbits run wild in foreign countries under new conditions of life, they by no means always revert to their aboriginal colour.
— from The Variation of Animals and Plants under Domestication by Charles Darwin

The pavements were very full, and the usual night crowds of London were surging to and fro in the glare of the shop lights, but somehow no one impeded their rapid movements, and they seemed to pass through the people as if they were smoke.
— from Four Weird Tales by Algernon Blackwood

Capt. Dilger, a Prussian officer, who commanded the battery faced the advancing men of Jackson until nearly cut off, losing one gun.
— from Company G A Record of the Services of One Company of the 157th N. Y. Vols. in the War of the Rebellion from Sept. 19, 1862, to July 10, 1865 by A. R. (Albert Rowe) Barlow

And even as I stood, smiling at my own small grandeur, came tender memories crowding thick upon me,—of a soft, warm lap, in which I had once loved to lay my head; of a face, fair, pensive, loving, lovely; of eyes whose deep and quiet light a shadow of unkindness never crossed; of lips that sweetly crooned the songs of a far-off, happy land; of a presence full of comfort, hope, strength, courage, victory, peace, that perfect harmony that comes of perfect faith,—a child's trust in its mother.
— from The English Governess at the Siamese Court Being Recollections of Six Years in the Royal Palace at Bangkok by Anna Harriette Leonowens