La buena ciencia no teme a la historia
La buena ciencia no teme a la historia
207. The eyes of moles and of some burrowing rodents are rudimentary in size, and in some cases are quite covered by skin and fur. This state of the eyes is probably due to gradual reduction from disuse, but…
206. The insects in Madeira which are not ground-feeders, and which, as certain flower-feeding coleoptera and lepidoptera, must habitually use their wings to gain their subsistence, have, as Mr. Wollaston suspects, their wings not at all reduced, but…
205. In some cases we might easily put down to disuse modifications of structure which are wholly, or mainly due to natural selection. Mr. Wollaston has discovered the remarkable fact that 200 beetles, out of the 550 species (but…
He traducido al español el artículo de C.E. Brown-Sequard al que se refería Darwin en el párrafo ducentésimo cuarto de OSMNS. El artículo se publicó en The Lancet, 2. y la traducción es como sigue (al final, el artículo…
204. Kirby has remarked (and I have observed the same fact) that the anterior tarsi, or feet, of many male dung-feeding beetles are often broken off; he examined seventeen specimens in his own collection, and not one had even…
Volvemos con el mismo tema tratado en el capítulo primero: Los efectos del uso y desuso de los órganos, en apartado de clara tendencia lamarckista, cuyo titulo se ha modificado a gusto del autor, para dar entrada en esta escena…
202. In one sense the conditions of life may be said, not only to cause variability, either directly or indirectly, but likewise to include natural selection, for the conditions determine whether this or that variety shall survive. But when…
El párrafo dice que podrían darse ejemplos, tanto de variedades semejantes producidas por una misma especie en condiciones de vida tan diferentes como puedan concebirse, como de variedades diferentes producidas en condiciones externas iguales. Lamentablemente no vemos tales ejemplos por…
El párrafo es claro e ilustrativo como pocos lo son en la presente obra: When a variation is of the slightest use to any being, we cannot tell how much to attribute to the accumulative action of natural…
199. It is very difficult to decide how far changed conditions, such as of climate, food, etc., have acted in a definite manner. There is reason to believe that in the course of time the effects have been…