Evolution Theory
章节目录
共 45 段- It must first be pointed out that those lower Metazoa, like
- We have here a quite definite structural adaptation of the p
- We must therefore assume that, in many cases, the
- We assumed that there is a regeneration-idioplasm, and there
- But we learn more than this from the occurrence of identical
- In the case of ordinary plant-hybrids what are designated re
- I am not of the number of those who believe that we already
- It must not, therefore, be believed that the habit of the po
- I must first point out that co-adaptations occur not only in
- [Illustration: FIG. 105. Ovary of a fertile Queen-Ant and ov
- But how are these acquired characters to be transmitted sinc
- Hering attributes a similar power of memory and reproduction
- I have called these processes which are ceaselessly going on
- It is difficult to give any confident answer to this questio
- Hitherto we have derived the variations of the determinants
- But, apart from the fact that the assumption of this mode of
- We have already seen that the first increase in the growth o
- I have already mentioned that exceptions to the usual mode o
- But we must not on that account 'empty out the child with th
- It is in this way that I explain the fact that the majority
- But I do not regard this amphimixis as the real root of vari
- Haycraft also finds the significance of amphigony simply in
- But how much we can actually prove in regard to these concei
- How far the combination of these individual differences of c
- How could this really remarkable difference in the fertility
- In the tape-worms, too, cross-fertilization is not excluded,
- [25] As to the cases Maupas has brought into notice, of perm
- Let us first of all seek to gain clearness as to the composi
- We certainly know nothing of how far the minuteness of the d
- There can be no doubt of this in the case of the caterpillar
- There is thus an evolution of varieties due to amixia alone,
- On the other hand, it may be almost regarded as a law that a
- There are, however, many animal and plant forms which do not
- Adaptations, from their very nature, can only depend upon se
- The deep-sea expedition conducted by Chun in 1898 and 1899 m
- Our train of thought in the last lecture brought us back aga
- I do not believe therefore in a 'physiological selection,' i
- When we have thus recognized that the origin of a variation
- In discussing germinal selection I mentioned the view expres
- If we ask ourselves the question how the living beings which
- This is due to the fact that the variations of direct origin
- If we consider the number of obstacles that have to be overc
- The psychical phenomena, which we know from ourselves, and c
- Haeckel, Ernst, fundamental biogenetic law, ii. 173;
- Variations in spelling and hyphenation are retained.