 I formerly thought that when a tendency to produce the two sexes in equal numbers was advantageous to the species, it would follow from natural selection, but I now see that the whole problem is so intricate that it is safer to leave its solution for...  The Evolution of Sex - Page 38by Sir Patrick Geddes, John Arthur Thomson - 1889 - 322 pagesFull view - About this book
 | Charles Darwin - 1874 - 840 pages
...preponderate, but it is by no means obvious how this male-producing tendency could have boon acquired. I formerly thought that when a tendency to produce...it is safer to leave its solution for the future. CHAPTER IX. SECONDARY SEXUAL CHARACTERS IN THE LOWER CLASSES OF THE ANIMAL KINGDOM. These characters... | |
 | George Briggs Starkweather - 1883 - 318 pages
...their production, with the following confession of the inability of science to solve the enigma:— "I formerly thought that when a tendency to produce...it is safer to leave its solution for the future."* From this it is safe to assume that hitherto no positive knowledge has been acquired on this vital... | |
 | 1884 - 610 pages
...the problem as hopeless for the present, in the following words :—" I formerly thought that where a tendency to produce the two sexes in equal numbers...it is safer to leave its solution for the future." a Embryology has advanced to the rank of an independent and important science without elucidating the... | |
 | Sir Patrick Geddes - 1890 - 354 pages
...author, we may admit that it is the algebraic sum of these which he aims at expressing. is 9. Dancin's Position. — Neither in regard to the origin of sex,...sex-proportions, that reference to the latter is more profitable. § io. D Using on the Proportions of the Sexes, and the Regulation of these. — In an important work,... | |
 | Charles Darwin - 1890 - 724 pages
...tendency to produce the two sexes in equal numbers was advantageous to the species, it wpuld foUow&om natural selection, but I now see that the whole problem is so intricate that it is safer to leava its solution for the future. CHAPTER IX. SECONDARY SEXUAL CHARACTERS IN THE LOWER CLASSES OF... | |
 | Charles Darwin - 1896 - 890 pages
...equal numbers was advantageous to the species, it would follow from natural selection, but I now iioe that the whole problem is so intricate that it is safer to leav« its solution for the future. CHAPTER IX. SECONDARY SEXUAL CHARACTERS ra THB LOWER CLASSICS OF... | |
 | Charles Darwin - 1897 - 768 pages
...could have been acquired. I formerly thought that when a tendency to produce the two sexes in equsl numbers was advantageous to the species, it would...it is safer to leave its solution for the future. CHAPTER IX. SECONDARY SEXUAL CHARACTERS is THE LOWER CLASSES OP THE ANIMAL KINGDOM. classes — Brilliant... | |
 | 1905 - 462 pages
...preponderate, but it is by no means obvious how this male-producing tendency could have been acquired. I formerly thought that when a tendency to produce...it is safer to leave its solution for the future. CHAPTEE IX SECONDARY SEXUAL CHARACTERS IN THE LOWER CLASSES OF THE ANIMAL KINGDOM These characters... | |
 | Thomas E. Reed - 1913 - 328 pages
...formerly thought that when the tendency to produce both sexes in equal numbers was advantageous to a species, it would follow from natural selection, but...that the whole problem is so intricate that it is best to leave its solution to the future. ' ' The Influence of the Age of the Ovum Dusing" was probably... | |
 | John E. Grant - 1922 - 392 pages
...labour, is no mere figure of speech. The Proportion of the Sexes. In the Descent of Man Darwin confesses: "I formerly thought that when a tendency to produce...it is safer to leave its solution for the future." There is a very simple solution at hand in the theory of transgressive growth. That the sex quantities... | |
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