Image d'archive à partir de la page 319 de l'American spiders et leur rotation. American spiders et leur travail de bobinage. Une histoire naturelle de l'orbweaving spiders des États-Unis, avec une attention particulière à leurs habitudes et de l'industrie Année : 1889 CUbiodiversity1121211-9810 ( au-delà des faits qu'il a conclu, premièrement, que la fonction des trois types de cheveux décrits ci-dessus ne peuvent pas être reconnues comme identiques ; et, deuxièmement, qu'aucun de ces types peuvent être considérés comme un organe .auditif. Mais, si leur fonction n'est pas identiques, leur ressemblance fondamentale dans la structure anatomique donne à l'un un droit de supposer que

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Archive image from page 319 of American spiders and their spinning. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits CUbiodiversity1121211-9810 Year: 1889 ( above facts he concluded, first, that the function of the three types of hair above described cannot be recognized as identical; and, second, that no one of these types can be regarded .as an auditory organ. But, if their function is not identical, their fundamental likeness in anatomical structure gives one a right to suppose that they do have a function more or less analogous. Wherein does that function consist ? Mr. Wagner con- siders that the function of the Tactile hairs ought to be more perfect than that of the other types, because of their more per- fect structure, and that, therefore, they should be capable of receiving more delicate excitations than the ordinary Tactile hairs. One use, he thinks, may have been indicated by Dahl, who re- marks that the slightest breath of air is able to move the auditory hairs, a fact which may be readily observed ; at least, that spiders are always extremely sensitive to the slightest puff of wind made by the human mouth. There may, therefore, be assigned to the auditory hairs the function of transmitting the mechanical movements of the air. Wagner again raises the conjecture that the Beaded and Clubshaped hairs may be used to in- dicate the state of the weather; a conjecture which he bases upon what he supposes to be an ac- cepted fact, namely, that spiders are so sensitive to weather changes as to be able to anticipate them, and, indeed, to prognosticate them by their behavior. That this is a widespread belief I else- where indicate (in the chapter on General Habits); but that it is without foundation, I think, I also show; so tliat Mr. Wagner's suggestion must fall to the ground before the presence of facts of habit. Fig. 296. Section of a fine Tactile hair, p

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