British medical journal . breathing tubes, or traclieae, are also leftbehind. Should the discarded skin not be eaten by theemergent insect, it remains on the floor and might easilybe mistaken for a sedentary cockroach but for the factthat live cockroaches never are sedentary. Thcnueomplotc metamorphosis, the generalized characterif tlienervures of the hind wings, the complete seiiarationt the three thoracic segments (or rather their want ofI iision so conspicuous in the higher insects—the flies audllie becsi, and the undifferentiated condition of the mouthorgans, all point to the insect being
British medical journal . breathing tubes, or traclieae, are also leftbehind. Should the discarded skin not be eaten by theemergent insect, it remains on the floor and might easilybe mistaken for a sedentary cockroach but for the factthat live cockroaches never are sedentary. Thcnueomplotc metamorphosis, the generalized characterif tlienervures of the hind wings, the complete seiiarationt the three thoracic segments (or rather their want ofI iision so conspicuous in the higher insects—the flies audllie becsi, and the undifferentiated condition of the mouthorgans, all point to the insect being of a primitive there is no doubt that, whether a primitive insect ornot. the cockroach is a very successful one; it is an arririsie—as our lively friend, the Gaul, to quote Mr. Jlicawber,would say—probably owing to its attaching itself in allcases, and witli unvaried devotion, to the habitation ofJiien. Not popular with humanity, it nevertheless cease-lessly extends its domain by slowly yet surely enteringC. 1 —Cast skin of olderujniph (pupa). ^ 2*. into new aud hitherto uneonqnered human spite of insect traps and vermin killers, it is extremelvdifBcult to eradicate from a house when once it is wellestablished. It has, in fact, gradually dislodged in mostplaces in Great Britain and Ireland the oTd domestic
Size: 1135px × 2201px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjectmedicine, bookyear185
