. Laboratory problems in civic biology. Biology. 150 THE ECONOMIC IMPORTANCE OF ANIMALS b. The Larva (Wiggler) Materials. â The eggs will hatch if kept in a warm place, ( wigglers can be scooped from a pond or pool of water. Thei may be kept in a screened battery jar half full of water. Observations. â What is the shape of the larvae? How c they move throu^ ;ni^,-.,»^_^^^â,..<-<^J^^ the water? Wat< ^ ,VA4tt,uuJ^W1^:^â y^ *^6 lawse while at tl is up? (Note tl breathing tube th, reaches through tl surface of the water.) What is the position of the larvae whi at the surface? If they lie
. Laboratory problems in civic biology. Biology. 150 THE ECONOMIC IMPORTANCE OF ANIMALS b. The Larva (Wiggler) Materials. â The eggs will hatch if kept in a warm place, ( wigglers can be scooped from a pond or pool of water. Thei may be kept in a screened battery jar half full of water. Observations. â What is the shape of the larvae? How c they move throu^ ;ni^,-.,»^_^^^â,..<-<^J^^ the water? Wat< ^ ,VA4tt,uuJ^W1^:^â y^ *^6 lawse while at tl is up? (Note tl breathing tube th, reaches through tl surface of the water.) What is the position of the larvae whi at the surface? If they lie horizontal to the surface, they a the larvae of the anopheles, the malarial mosquito; if at an acu angle, the larvae are those of culex, the harmless mosquito. c. The Pupa Method and Observations. â Place a number of wigglers in screened battery jar. Allow them to cast off their skins ar become pupae. How does this stage differ from the larval stage? Notice the empty shells of the pupte floating on the surface of the water. How did the adult mosquitoes get out? Do the pupae come to the surface of the water? If so, whj Compare the position of the pupae at rest with the figures, the mosquito a culex or an anopheles ? d. The Adult Observations. â In a hatched adult observe the number ar kind of wings. In which insect group do mosquitoes belong Notice the antennae or feelers. (The males have more busl. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1916
