. A text-book of agricultural zoology. Zoology, Economic. ---&. ~ n Pia. , Tbaohba, and ii, Side-view of part of Abdomen, showing spiracle (Sp). T, Tergum; S, sternum; a, spiral fibre; 6, inner coat; c, outer coat air. This can be easily demonstrated by plunging the opened cockroach under water, when the tubes will be shown as silvery threads, due to the contained air in them. These air-tubes or trachecB (fig. 35, i.) commence at the spiracles and run to all parts of the body. "When minutely examined the tracheae will be seen to be circumscribed by a dark spiral band (a). Ee-
. A text-book of agricultural zoology. Zoology, Economic. ---&. ~ n Pia. , Tbaohba, and ii, Side-view of part of Abdomen, showing spiracle (Sp). T, Tergum; S, sternum; a, spiral fibre; 6, inner coat; c, outer coat air. This can be easily demonstrated by plunging the opened cockroach under water, when the tubes will be shown as silvery threads, due to the contained air in them. These air-tubes or trachecB (fig. 35, i.) commence at the spiracles and run to all parts of the body. "When minutely examined the tracheae will be seen to be circumscribed by a dark spiral band (a). Ee- spiration takes place by these tubes, carrying the air to all parts of the body and its organs, hence blood-vessels are not so neces- sary as when one definite area only is for respiratory func-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
