The book Zoology: Descriptive And Practical was written by author Colton, Buel P. (Buel Preston), 1852-1906 Here you can read free online of Zoology: Descriptive And Practical book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Zoology: Descriptive And Practical a good or bad book?
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Topics for Reports. — Varieties of Earthworms. Marine Worms. Leeches. CHAPTER VII. MOLLUSCA. FIELD STUDY OF FRESH-WATER CLAM. Look for clams in the shallow water of creeks and lakes. Note the natural position. How much of the shell is embedded ? Is the shell open or shut? Can you see any openings by means of which the clam communicates with the water ? Touch the clam and note any changes that take place. Quickly pull up the clam and note the extended foot. Watch clams to see if they move. Do th...ey move with the same end always foremost? How does the foot point with reference to the direction of locomotion? Does a clam make a track? Can you tell by the track in which direction the clam traveled? Does the direction of travel have any relation to the current of the stream ? Why do clams loco- mote ? If possible, make a series of observations to find out the rate of locomotion. Where are clams more abundant, on sandy or on muddy bottoms ? How many kinds do you find ? Do differ- ent kinds show preference as to soil?
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