Download A history of theories of ether and electricity. The by Edmund T. Whittaker PDF
By Edmund T. Whittaker
In 1910 I released a piece less than the name A historical past of the Theories of Aether and electrical energy, from the age of Descartes to the shut of the 19th century. while the unique variation used to be exhausted, I felt that any new factor should still describe the origins of relativity and quantum-theory, and their improvement seeing that 1900. My possibilities have been notwithstanding no longer enough to permit me to arrange a correct and fully-documented account of this very inventive interval, and that i used to be forced to put the plan apart. Retirement from my professorial chair has made it attainable for me to take in this undertaking back ; it's going to occupy volumes, of which this, the 1st, offers with the classical theories. the amount of 1910 has been to a substantial volume rewritten, with the incorporation of a lot extra fabric ; and within the moment quantity, the tale can be persevered to the current time.
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Extra resources for A history of theories of ether and electricity. The classical theories
This "hybrid inviability" is one type of "post-zygotic" reproductive isolation. (iii) Gonadal barrier. " In his Notes on Hybridity(1862, 707) Darwin recognized that one barrier might occur first and then be replaced by another: "I suspect...
Having adopted the view that evolutionary change can only be brought about by natural selection, Darwin is confronted with a logical impasse. How can natural selection contribute to reproductive isolation when natural (phenotypic) selection is, after all, about selection of individuals for reproductive success, not for reproductive failure! However, Darwin continues: It may be admitted ... that it would profit an incipient species [variety] if it [the offspring] were rendered in some slight degree sterile when [members of the species were] crossed with ...
Darwin further notes (171): "An individual animal... " He is here contradicting himself in that he has already admitted (see above) that:"... it would profit an incipient species [variety] if it [its members] were rendered ... " This would indeed "indirectly give ... , the collective of individuals which constitutes an incipient species]. It will be shown later (chapter 4) that selective fertility (infertility with one group, while retaining fertility with another) might not necessarily result in the production of fewer offspring when viewed from Darwin's natural selection perspective.