[151] Ann. de Chimie, xii. 273.

[152] F. L. A. Sorg, Respirat. Insect. et Verm. Ellis, Inquiry into Chang. prod. on Atmosph. Air by Respirat. &c. 69.

[153] Ann. de Chimie, xii. 273.

[154] Sprengel, Commentar. &c. 27—.

[155] Plate [XXIII]. Fig. 2. and Plates VIII. IX. XVI. XXIX. c´,h´´, m´´, A´´, D´´.

[156] Moldenhawers (Anat. der Pflanz. 314—.) affirms that the spiracles of most insects are quite closed: but Sprengel (Commentar. § 8.) has satisfactorily refuted that opinion.

[157] Plate [XXIII]. Fig. 2.

[158] Sprengel, Commentar. § 7.

[159] Ibid. t. iii. f. 30.

[160] Plate [XXIX]. Fig. 23.