. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PISCES. 975 that of their teeth and bones, as will be evident from the following analysis made by M. Che- vreul of the scales of a Lepidosteus, of a Cheto- don, and of the Perca labrax, after they had been thoroughly dried by exposure during six weeks to a dry atmosphere. In drying, the scales of Lepidosteus lost per cent., of Chetodon 13 per cent., and those of the Perca labrax 16 per cent. Scales o f Lepi- Perca Cheto- dosteus labrax. don. Fatty matter principally con- sisting of oleine Azotized ma
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PISCES. 975 that of their teeth and bones, as will be evident from the following analysis made by M. Che- vreul of the scales of a Lepidosteus, of a Cheto- don, and of the Perca labrax, after they had been thoroughly dried by exposure during six weeks to a dry atmosphere. In drying, the scales of Lepidosteus lost per cent., of Chetodon 13 per cent., and those of the Perca labrax 16 per cent. Scales o f Lepi- Perca Cheto- dosteus labrax. don. Fatty matter principally con- sisting of oleine Azotized matter . Chloride of sodium . Trace Trace. Sulphate of soda • Subcarbonaie of soda ' Subcarbonate of lime Phosphate of lime (of b ne) Phosphate of magnesia Peroxide of iron . Trace Trace Trace 0 00 \It\J\J ^ Iii a preceding article (see OSSEOUS SYSTEM, Comp. we have endeavoured to shew that the scales which invest the exterior of the body constituting the exoskeleton of Fishes, by progressive modifications in their size, tex- ture, and arrangement, are converted into very various organs, namely, the apparently osseous plates that cover Lepidosteus and Ostracion, the formidable prickles that stud the external surface of the Diodons, the opercular flaps of the Sturgeon, and even those of the osseous Fishes; the spines of Ga&terosteun, and those which in Silurus, Ba- listes, and Lop/iius, were likewise proved to belong to the epi- dermic or tegumen- tary system; lastly, the fin-rays and in- terspinous bones of the vertical fins were found to be derivations from the exoskeleton, instead of being, as they have long been considered, parts ap- pertaining to the en- doskeleton or true osseous system. The dental organs of vertebrate animals have very naturally been regarded by the old anatomists who confined their osteolo- gical researches
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