 | 1871 - 612 páginas
...such case be an advantage; and, if so, natural selection would constantly aid the effects of disease. As it is difficult to imagine that eyes, though useless,...in any way injurious to animals living in darkness, I attribute their loss wholly to disuse. In one of the blind animals of the Mammoth Cave — namely,... | |
 | 1881 - 420 páginas
...by a calcareous knob ; the condition was one to which the words of Mr. Darwin may well be applied, ' The stand for the telescope is there, though the telescope with its glasses has been lost.' Specimens of the same species taken from still greater depths (from 500-700 fathoms) exhibited a still... | |
 | John Gibson - 1884 - 392 páginas
...Equally interesting are the blind cray-fish of these caves, in which, as Darwin remarks, the footstalk for the eye remains, though the eye is gone. " The...though the telescope, with its glasses, has been lost." It is significant, however, of the mode of origin of those blind crustaceans that in the young the... | |
 | Francis Jeffrey Bell - 1885 - 582 páginas
...replaced by a calcareous knob ; it is a case to which the words of Darwin are altogether applicable : " The stand for the telescope is there, though the telescope with its glasses has been lost." Specimens of the same species, taken from a greater depth (500 to 700 fathoms), showed that the eye-stalk... | |
 | Francis Warner - 1885 - 476 páginas
...Species," p. 110. are blind. In some of the crabs the foot-stalk for the eye remains, though the eye be gone ; the stand for the telescope is there, though the telescope with its glasses has gone. As it is difficult to imagine that eyes, though useless, could be in any way injurious to animals... | |
 | Francis Warner - 1886 - 408 páginas
...Species," p. 110. are blind. In some of the crabs the foot-stalk for the eye remains, though the eye be gone; the stand for the telescope is there, though the telescope with its glasses has gone. As it is difficult to imagine that eyes, though useless, could be in any way injurious to animals... | |
 | Francis Warner - 1887 - 170 páginas
...Kentucky are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone. As it is difficult to imagine that eyes, though useless,...two of which were captured by Professor Silliman, at about half a mile distant from the mouth of the cave, and therefore not in the profoundest depth, the... | |
 | Charles Frederick Holder - 1887 - 272 páginas
...eyes ; but, beyond one hundred and ten fathoms, the}- had changed as above stated. As Darwin has said, the stand for the telescope is there, though the telescope with its glasses has been lost. Probably many of the deep-sea forms are luminous in some way.40 Aristeus and allied forms are -known... | |
 | Francis Warner - 1890 - 268 páginas
...Kentucky are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone. As it is difficult to imagine that eyes, though useless,...two of which were captured by Professor Silliman, at about half a mile distant from the mouth of the cave, and therefore not in the profoundest depth, the... | |
 | Francis Warner - 1890 - 288 páginas
...Kentucky are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone. As it is difficult to imagine that eyes, though useless,...two of which were captured by Professor Silliman, at about half a mile distant from the mouth of the cave, and therefore not in the profoundest depth, the... | |
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It is well known that several animals, belonging to the most different classes, which inhabit the caves of Carniola and of Kentucky, are blind. In some of the crabs the foot-stalk for the eye remains, though the eye is gone; — the stand for the telescope... 
