Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . INSECTA. 383 eight pairs of apertures ; in the stag-beetle {fig. 152) there are sixpairs ; in the humble-bee five pairs; in the phasma there is, accordingto Miiller, only a single pair at the posterior chamber of the heart,by which, in fact, in all Insects, the chief currents of the bloodappear to enter the organ. As far as the head the blood is propelledfrom the heart along a tubular aorta of the usual form; but thebranches from this (b) would appear soon to lose thems
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . INSECTA. 383 eight pairs of apertures ; in the stag-beetle {fig. 152) there are sixpairs ; in the humble-bee five pairs; in the phasma there is, accordingto Miiller, only a single pair at the posterior chamber of the heart,by which, in fact, in all Insects, the chief currents of the bloodappear to enter the organ. As far as the head the blood is propelledfrom the heart along a tubular aorta of the usual form; but thebranches from this (b) would appear soon to lose themselves in thegenerally diffused sinuses. In the Myriapoda, however, the blood iscontinued in a vessel along the dorsal aspect of the ventral nervouschord; but the traces of the true tubular vascular system are scantyand obscure. The blood of Insects is usually a colourless fluid, sometimesgreenish or straw-coloured, rarely, as in the larvie of Chironomus,approaching to a red colour: it contains flattened oat-shaped par-ticles, which are sometimes tuberculated. Cuvier, misled by the anomalous diffused condition of the ven
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
