Archive image from page 25 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( 362 THE TRACHEAL SYSTEM OF THE IMAGO. with a portion of the tracheal sacs and the surrounding integu- ment, by an incision made about one millimetre from the edge of the spiracle, and surrounding it. If this is done, the tracheal sacs will be found
Archive image from page 25 of The anatomy, physiology, morphology and. The anatomy, physiology, morphology and development of the blow-fly (Calliphora erythrocephala.) A study in the comparative anatomy and morphology of insects; with plates and illustrations executed directly from the drawings of the author; CUbiodiversity4765349-9875 Year: 1890 ( 362 THE TRACHEAL SYSTEM OF THE IMAGO. with a portion of the tracheal sacs and the surrounding integu- ment, by an incision made about one millimetre from the edge of the spiracle, and surrounding it. If this is done, the tracheal sacs will be found full of air. If before removing the spiracle the insect is immersed for a few seconds in alcohol to remove the wax, the vestibule will be found full of fluid. The efficiency of the internal valve is then seen to be very great, as no air will escape from the tracheal sacs through the spiracle. Of course, the dissection must be made under water or dilute Miiller's fluid. I use one part Miiller to ten of water. Fig. 48.—The Abdominal Spiracular Apparatus of the Imago : /, a semi-iiiagram- nialic representation of the spiracular apparatus of the third abdominal spiracle ; £, another view of the same, with a portion of the wall of the atrium removed to show the external valve ; j, a section of the vestibule and trachea, showing the flaps of the internal valve ; a, atrium ; /, lever; ,(, spiracle ; tr, trachea ; v, con- tractile vestibule. I have frequently observed that the tracheal sacs expand when relieved from the pressure of surrounding parts, showing that they contain compressed air. There are several valves opening inwards in the course of the
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