. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. THE FARM STREAM 43. Fig. 24. The larvae of four two-winged flies {Diptera): a, the swale-fly {Sepedon), withdrawing beneath the surface film of the water; b, the punkie (Ceratopogon); c, the phantom midge larva (.Corethra); and d, the common midge (Chironomus), the rapids. Note the extent of mud, sand, gravel, rubble, and flat- stone-bottom, and their relation to slope and cur- rent. Note also the physical conditions that organisms have to meet in each situation. Coll
. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. THE FARM STREAM 43. Fig. 24. The larvae of four two-winged flies {Diptera): a, the swale-fly {Sepedon), withdrawing beneath the surface film of the water; b, the punkie (Ceratopogon); c, the phantom midge larva (.Corethra); and d, the common midge (Chironomus), the rapids. Note the extent of mud, sand, gravel, rubble, and flat- stone-bottom, and their relation to slope and cur- rent. Note also the physical conditions that organisms have to meet in each situation. Collect and examine the commoner plants and animals, first of the rapids and then of the still water, omitting the fishes, save, for noting where fishes are seen. The Record of this study wUl consist of: I. A map, on which are indicated as clearly as possible: 1. Waterfalls and riffles. 2. The extent of each sort of bottom. 3. The principal plant beds. 4. The fish pools. II. List of all the water plants observed, arranged in a table with column headings as follows: Name (this will be supplied by the instructor). Grows where (that is, in which of the situations examined). Depth of water (approximate). Growth-habit (simple or branched, erect or trailing, stem- less, leafless, etc.). Remarks. III. List of all the water animals observed, arranged in a table with column headings as follows: Name (this will be supplied by instructor, if needed). Lives where (in which of the situations examined).. 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 Needham, James G. (James George), 1868-1956. Ithaca, N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
