The Bookshelf for boys and girls Book of Wonders and Curious Things (1912)
University Society, New York · New York: University Society · leaf 125
THE TWO MtJSCLES OF THE MUSSEL.Pulling against the fingers which are trying to separate the shell. arm of a man are arranged at great disadvantage, power being sacrificed for amount and rapidity ily, not trying to open it at once, but simply to of motion. keep it from closing. The mussels muscles… … SHOWING THE MUSCLES (M1 AND M2) CUT ACROSS.The shell now opens out easily. your mouth and six to close it. The mussel, beinginside of the shell, cannot open it by means of amuscle; but his two valves are joined by a greatligament so arranged that it will hold the shellopen all the time. The shell…
Children's literature · Children's encyclopedias and dictionaries · Literature · Encyclopedias and dictionaries
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