. Animal activities : a first book in zoölogy. Zoology; Animal behavior. MATERIAL FOR STUDY. Another method of purifying the air in water consists in forcing a stream of air through it. This is not prac- ticable in most schoolrooms. Pouring fresh water against the side of the aquarium in such a way that many bub- bles of air are caught in the descending stream is a common and easy method. Large aquaria frequently have a constant supply of running water with a regular outflow. Such aquaria are hardly neces- sary in most schools. Small rectangular glass vessels and common battery-jars answer eve
. Animal activities : a first book in zoölogy. Zoology; Animal behavior. MATERIAL FOR STUDY. Another method of purifying the air in water consists in forcing a stream of air through it. This is not prac- ticable in most schoolrooms. Pouring fresh water against the side of the aquarium in such a way that many bub- bles of air are caught in the descending stream is a common and easy method. Large aquaria frequently have a constant supply of running water with a regular outflow. Such aquaria are hardly neces- sary in most schools. Small rectangular glass vessels and common battery-jars answer every purpose. Fig. 7.—An American Pond- 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 French, Nathaniel S. (Nathaniel Stowers), 1854-. New York ; London : Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecta, booksubjectzoology
