Abstract

IN demonstrating the action of ciliated epithelium to students, we have in the past used the opened mouth and gullet of a frog and allowed powdered cork to be dropped on to the upper part of the mouth. In about three minutes the cork has been carried right down the aesophagus. We have just performed the experiment, using lycopodium in place of the cork, and it works very well. Advantages of the lycopodium are: (1) uniform powder ; (2) not miscible with water or mucin ; (3) colored yellow, very easily seen ; (4) very light in weight.

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