Lessons On Shells As Given in a Pestalozzian School At Cheam Surrey
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Teacher. Yes. A litttle experiment will lead you to detect another characteristic of this genus. Observe, I fill this shell (a Turbo) with water to the edge of the lips has any of the liquid run over? Child. No ; the shell holds the water like a cup. 6 62 LESSON IX. Teacher* When this is the case, the mouth is said to be contracted. But observe what is the consequence, when I attempt to fill a cone with water yp to the lips. Child; The water runs out before it reaches the lips. Teacher. Examine... where the liquid flows out, and what is the cause of this difference in the two shells^ Child. The water flows out at the base of the cone. In the other shell the lips are united ; in the cone they are separated by a small channel. Teacher. This channel is called a sinus, from the Latin sin us, a curved line. If the two lips be separated by a sinus, liquid poured in overflows before it reaches the lips ; the aperture in this case is called effuse, from the Latin fu- sus, which signifies poured out.
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