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THE POPULAR SCIENCE MONTHLY 



inches farther they appear to be double. A model of them at this part 

 of the tube can be obtained by locking the fingers of both hands one 

 into the other. Just as the trachea leaves the bony box it is consider- 

 ably enlarged. 



T is the tongue, attached to the bifurcated hyoid bone; LA is the larynx; TK is the trachea 

 immediately before it buries itself in the peculiar hollow box of bone, A. In this box, as 

 already described, it becomes convoluted ; then, leaving the box, it enters the cavity of the 

 chest, aud joins the lungs at L. 



Of course, the use of this curious structure is to produce those 

 wonderful sounds which are peculiar to the crane. In fact, it is a 

 portion of a comet-d-piston or trombone, and is, no doubt, worked by 

 some very delicate muscles. I have never had the pleasure of seeing 

 cranes fly in the air, but I am told that the noise they make is very 

 wonderful. Wc read: "Cranes range, according to the season, from 

 the north of Europe to the south of Asia, and north of Africa, and in 

 the latter country they are said to extend their migrations as far as 

 the Cape of Good Hope. On these excursions they fly high in the air, 

 though they experience some difficulty in getting on the wing from 

 the ground. Before taking their spring they run some paces, raise 

 themselves a little at first, and then unfold a powerful and rapid wing. 

 In the air they form very nearly an isosceles triangle, possibly for the 

 purpose of cutting the element with greater facility. When attacked 



