. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. i^lH CorXTUY BArTEIlIA (\i\ «Ti:iti.\ Wintt-r , Sprini; . Suinnier Autumn Averaije. Bacteria of water. Streams orclinaiily coiiiain alioiit .')0(i bacteria i)vv cubic centimeter, collected from tlic air and s(»il over the area drained. Hie riser Seine, as it enters J*aris, lias about 300 bacteria per cul)ic centimeter, 1)iit alter it receives the sewage from this city it contains 2(MI,<MH) bacteria per cu- bic centimeter. The su})posed self-purification of stre
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. i^lH CorXTUY BArTEIlIA (\i\ «Ti:iti.\ Wintt-r , Sprini; . Suinnier Autumn Averaije. Bacteria of water. Streams orclinaiily coiiiain alioiit .')0(i bacteria i)vv cubic centimeter, collected from tlic air and s(»il over the area drained. Hie riser Seine, as it enters J*aris, lias about 300 bacteria per cul)ic centimeter, 1)iit alter it receives the sewage from this city it contains 2(MI,<MH) bacteria per cu- bic centimeter. The su})posed self-purification of streams is found to be mainl} due to dilution. Experts are impdundintr I'unnincT water hi reservoirs previous to supj)l\inf^ cities, since bacteria disappear from still water. Microscopic or^-anisms (plankton) ui)ou which young fishes feed are found in greater abundance in (luiet water, and it is thouoht that thev in turn feed upon bacteria. AVater in ^\â ells varies great!}' in minibcr of bacteria. Arte- sian wells are practically free from them : ordinarv widls mav contain from 1000 to 8000 bacteria jx-r cubic centimeter. Ice varies in number of bacteria accoiding to water from which it is taken. ("lear ice from the Hudson Rivei-contained . bacteria per cubic centimeter, while its snow ice contained Hi S7. \\']\\ ? Bacteria of the soil. The nund)er of bacteria of the soil varies with the amount ol moisture an<l organic debris. Sn- pci-ficial layers contain from 10,000 to ,() 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 Hodge, Clifton Fremont, 1859-; Dawson, Jean, 1873-. Boston, Ginn
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