Dir\u00eda yo que no…..<\/a><\/p>\n <\/p>\n
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\u00a0<\/em><\/p>\n352<\/em><\/p>\n\u00a0<\/em><\/p>\nWe will return to Mr. Mivart’s other objections. Insects often resemble for the sake of protection various objects, such as green or decayed leaves, dead twigs, bits of lichen, flowers, spines, excrement of birds, and living insects; but to this latter point I shall hereafter recur. The resemblance is often wonderfully close, and is not confined to colour, but extends to form, and even to the manner in which the insects hold themselves. The caterpillars which project motionless like dead twigs from the bushes on which they feed, offer an excellent instance of a resemblance of this kind. The cases of the imitation of such objects as the excrement of birds, are rare and exceptional. On this head, Mr. Mivart remarks, \u00abAs, according to Mr. Darwin’s theory, there is a constant tendency to indefinite variation, and as the minute incipient variations will be in ALL DIRECTIONS, they must tend to neutralize each other, and at first to form such unstable modifications that it is difficult, if not impossible, to see how such indefinite oscillations of infinitesimal beginnings can ever build up a sufficiently appreciable resemblance to a leaf, bamboo, or other object, for natural selection to seize upon and perpetuate.\u00bb<\/em><\/p>\n\u00a0<\/em><\/p>\n\u00a0<\/em><\/p>\nVolvamos a las otras objeciones de m\u00edster Mivart. Los insectos muchas veces se asemejan para protecci\u00f3n a diferentes objetos, tales como hojas verdes o secas, ramitas muertas, pedazos de liquen, flores, espinas, excrementos de aves o insectos vivos; pero sobre este \u00faltimo punto insistir\u00e9 despu\u00e9s. La semejanza es muchas veces maravillosa, y no se limita al color, sino que se extiende a la forma y hasta a las actitudes de los insectos. Las orugas, que se mantienen inm\u00f3viles, sobresaliendo como ramitas muertas en las ramas en que se alimentan, ofrecen un excelente ejemplo de semejanza de esta clase. Los casos de imitaci\u00f3n de objetos, tales como el excremento de los p\u00e1jaros, son raros y excepcionales. Sobre este punto hace observar m\u00edster Mivart: \u00abComo, seg\u00fan la teor\u00eda de m\u00edster Darwin, hay una tendencia constante a la variaci\u00f3n indefinida, y como las peque\u00f1as variaciones incipientes deben ser en todas direcciones, tienen que tender a neutralizarse mutuamente y a formar al principio modificaciones tan inestables, que es dif\u00edcil, si no imposible, comprender c\u00f3mo estas oscilaciones indefinidas, infinitamente peque\u00f1as al principio, puedan nunca constituir semejanzas con una hoja, ca\u00f1a u otro objeto lo suficientemente apreciables para que la selecci\u00f3n natural se apodere de ellas y las perpet\u00fae\u00bb.<\/em><\/p>\n <\/p>\n
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Lectura aconsejada:<\/p>\n
\u00a0Manual para detectar la impostura cient\u00edfica: Examen del libro de Darwin por Flourens.<\/a> Digital CSIC, 2013. 225 p\u00e1ginas.<\/p>\n","protected":false},"excerpt":{"rendered":" La objeci\u00f3n de Mivart es elocuente\u2026\u2026\u2026\u2026\u2026\u2026\u00bfSe defender\u00e1 el autor adecuadamente de ella? ……Dir\u00eda yo que no….. \u00a0 352 \u00a0 We will return to Mr. Mivart’s other objections. Insects often resemble for the sake of protection various objects, such as green or decayed leaves, dead twigs, bits of lichen, flowers, spines, excrement of birds, and living insects; but to this latter point I shall hereafter recur. The resemblance is often wonderfully close, and is not confined to colour, but extends to form, and even to the manner in which the insects hold themselves. The caterpillars which project\u2026<\/p>\n","protected":false},"author":86,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[467],"tags":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":4}},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/137228"}],"collection":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/users\/86"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/comments?post=137228"}],"version-history":[{"count":9,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/137228\/revisions"}],"predecessor-version":[{"id":137501,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/posts\/137228\/revisions\/137501"}],"wp:attachment":[{"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/media?parent=137228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/categories?post=137228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/biologia_pensamiento\/wp-json\/wp\/v2\/tags?post=137228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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