[682] Ibid. v. 30—. t. v. f. 1-10. See above, p. [153]—.
[683] See above, Vol. II. p. [346.]
[684] Reaum. i. Mem. ult. De Geer i. 73. Swamm. Bibl. Nat. i. 184.
[685] Swamm. Ibid.
[686] Jurine Hymenopt. 16.
[687] iv. 342. Herold also attributes the rapid expansion of the wing to the flow of an aqueous fluid, which he calls blood, into the nervures, the orifices of which open into the breast. Entwickelungs. der Schmetterl. 101. sect. 106.—M. Chabrier, in his admirable Essai sur le Vol des Insectes (Mém. du Mus. 4ieme, ann. 325), having observed a fluid in the interior of the nervures of the wings of insects, thinks it probable that they can introduce it into them and withdraw it at their pleasure: the object of which, he conjectures, is either to strengthen them and facilitate their unfolding, or to vary the centre of gravity in flight, and increase the intensity of the centrifugal force.
[688] Ibid. 340.
[689] Brahm. Insek. ii. 423.
[690] Reaum. vi. 505—. t. xlvi. f. 9. Comp. De Geer ii. 627—.
[691] Reaum. iii. 378.