Sinopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908. Excerpt: ... INSECTS With the Fishes we concluded the survey of the backboned animals or Vertebrates, one of the main groups of the animal kingdom. These main groups are termed 'sub-kingdoms ' or ' phyla.' The Insects which are the subject of the present chapter, constitute the highest class of another subkingdom or phylum, that of the Arthropoda (i.e. animals with jointed legs), this phylum including also Centipedes and Millipedes, Spiders and Scorpions, and Crustaceans. Insects invariably have six legs and have thus appropriately also been called Hexapoda. The name 'Insects' refers to the division of the body into three sections, head, thorax and abdomen. Most Insects also possess two, or more rarely one pair of wings, distinguishing them from all other Arthropods, and, in common with the Centipedes, Millipedes, Spiders and Scorpions, they possess air tubes or tracheae which permeate the body and serve as respiratory organs, whilst the Crustaceans have gills. The Arthropods breathing by means of those air-tubes have therefore been called Tracheata. The body of Insects is enclosed by a horny or chitinous covering, and the head is provided with one pair of feelers or antennae. Everybody knows that from the eggs of Butterflies not Butterflies are hatched, but caterpillars, that these caterpillars, after having spent their whole existence in feeding and having thus greatly increased in size, change into a pupa or chrysalis, and that after a shorter or longer quiescent stage the perfect insect (or ' imago ') emerges from the chrysalis. It is similar with beetles and flies, only there the larva is not called caterpillar, but grub and maggot respectively. In Cockroaches and Grasshoppers on the other hand there is no such metamorphosis. The young ones emerging from the eggs...
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Reseña del editor
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908. Excerpt: ... INSECTS With the Fishes we concluded the survey of the backboned animals or Vertebrates, one of the main groups of the animal kingdom. These main groups are termed 'sub-kingdoms ' or ' phyla.' The Insects which are the subject of the present chapter, constitute the highest class of another subkingdom or phylum, that of the Arthropoda (i.e. animals with jointed legs), this phylum including also Centipedes and Millipedes, Spiders and Scorpions, and Crustaceans. Insects invariably have six legs and have thus appropriately also been called Hexapoda. The name 'Insects' refers to the division of the body into three sections, head, thorax and abdomen. Most Insects also possess two, or more rarely one pair of wings, distinguishing them from all other Arthropods, and, in common with the Centipedes, Millipedes, Spiders and Scorpions, they possess air tubes or tracheae which permeate the body and serve as respiratory organs, whilst the Crustaceans have gills. The Arthropods breathing by means of those air-tubes have therefore been called Tracheata. The body of Insects is enclosed by a horny or chitinous covering, and the head is provided with one pair of feelers or antennae. Everybody knows that from the eggs of Butterflies not Butterflies are hatched, but caterpillars, that these caterpillars, after having spent their whole existence in feeding and having thus greatly increased in size, change into a pupa or chrysalis, and that after a shorter or longer quiescent stage the perfect insect (or ' imago ') emerges from the chrysalis. It is similar with beetles and flies, only there the larva is not called caterpillar, but grub and maggot respectively. In Cockroaches and Grasshoppers on the other hand there is no such metamorphosis. The young ones emerging from the eggs...
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