[153] Phil. Mag., 1833. Reprinted in “Researches,” p. 44. Graham expressly applies the law of diffusion of gases to explain the respiration of Insects. Sir John Lubbock quotes and comments upon the passage in his paper on the Distribution of the Tracheæ in Insects. (Linn. Trans. Vol. XXIII.)
[154] For an explanation of the physical principles involved in this discussion, and for the calculation (based upon our own assumptions), we are indebted to Mr. A. W. Rücker, F.R.S.
[155] J. Hutchinson, Art. Thorax, Todd’s Cycl. of Anat. and Phys.
[156] De l’absence de mouvements respiratoires perceptibles chez les Arachnides (Archives de Biologie de Van Beneden et Van Bambeke, 1885.)
[157] Ueb. d. Respiration der Tracheaten. Chemnitz (1872).
[158] See table in Burmeister’s “Manual,” Eng. trans. p. 398.
[159] Art. “Insecta,” Cyc. Anat. and Phys., p. 989.
[160] Pogg. Ann. 1872, Hft. 3.
[161] Works, Vol. IX., p. 287. This passage has been cited by Rathke.
[162] Arbeiten a. d. Zool. Zoot. Inst. Würzburg. Bd. II., 1874.