396 DR MORRISON WATSON AND MR ALFRED H. YOUNG 
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series, vol, xvii. 
DIGESTIVE ORGANS. 
Tongue.—The tongue, from the anterior border of the hyoid bone to the tip, 
measures 9 inches in length and has a uniform breadth of 21 inches. The 
anterior 4 inches of the organ is alone clearly defined from the floor of the 
mouth by means of a well-marked groove which indicates the separation — 
between these parts. Posteriorly this groove disappears, so that the posterior 
half of the tongue forms the floor of the mouth, its upper surface being quite 
continuous with that of the cheek. In form, the tongue reminds one to some ~ 
extent of the sole of a shoe, being flattened from above downward, with its 
anterior extremity uniformly rounded. Its upper surface is flat and smooth 
and its anterior or free margin is provided with numerous flattened foliaceous 
projections of the mucous membrane. The posterior two thirds of the upper 
