79개의 결과 중 1 - 5개
Geoffroy seems to have relied chiefly on the conditions of life, or the " monde
ambiant," as the cause of change ; but he was cautious, and, as his son says, " C'
est done un probleme a reserver entiercment a l'avenir, suppose" meme que ...
357) suggested that as new diseases, supposed to have been caused by some
miasma, have arisen and spread over the world, so at certain periods the germs
of existing species may have been chemically affected by circumambient ...
Page I CHAPTER I. VARIATION UNDER DOMESTICATlON. Causes of Variability
— Effects of Habit— Correlation of Growth— Inheritance— Character of Domestic
Varieties — Difficulty of distinguishing between Varieties and Species — Origin ...
On the generality of intercrosses between individuals of the same species— Cir
cumstances favourable and unfavourable to Natural Selection, namely,
intercrossing, isolation, number of individuals— Slow action-- Extinction caused
by Natural ...
Naturalists continually refer to external conditions, such as climate, food, &c, as
the only possible cause of variation. In one very limited sense, as we shall
hereafter see, this may b6 true ; but it is preposterous to attribute to mere external
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