. Elementary exercises for the deaf and dumb . Sphinx or Hawk-moth. [ 294 ] (83<Z EXERCISE.)INJURIOUS INSECTS. &. Which arc injurious insects ? T. Some of the insects which annoy and injure mankind,are the following, viz. The Cock-roach The Ilcssian-fly The Grass-hopper The Wheat-insectAnts Flies Fleas Moschetocs The ChigreMoths Bed-hugs The Bot-fly The Scorpion S. How does the cock-roach injure us ? T. The cock-roach is an ugly looking inseet. Jt nmhi-plies in great numbers, and infests houses and places wherebread and flour and other provisions are deposited. Theycreep into holes an
. Elementary exercises for the deaf and dumb . Sphinx or Hawk-moth. [ 294 ] (83<Z EXERCISE.)INJURIOUS INSECTS. &. Which arc injurious insects ? T. Some of the insects which annoy and injure mankind,are the following, viz. The Cock-roach The Ilcssian-fly The Grass-hopper The Wheat-insectAnts Flies Fleas Moschetocs The ChigreMoths Bed-hugs The Bot-fly The Scorpion S. How does the cock-roach injure us ? T. The cock-roach is an ugly looking inseet. Jt nmhi-plies in great numbers, and infests houses and places wherebread and flour and other provisions are deposited. Theycreep into holes and corners, and hide themselves in theday-time, but at night they crawl out and eat the bread, theflour and other food prepared for man. S. I have seen grass-hoppers ; they do not hurt any body. T. Some of them are harmless, and when they are notnumerous they do no injury. But sometimes, and in somecountries, they increase and become so numerous as to eatup the grass and grain, and even the leaves of the trees,and nothing is left for man or his domestic animal
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