158 



REPTILES AND BIRDS. 



countries where they are common, and attain size, their flesh is univer- 

 sally used for food, and their carapace employed as a canoe. The 

 natives even roof their huts with them ; convert them into drinking- 

 troughs for their cattle and into baths for their children. According 

 to Strabo and Pliny, the ancient inhabitants of the shores of the 

 Indian Ocean and the Red Sea converted the Turtle's carapace 

 into similar uses. The fat of many .species, when fresh, is used as 



:*Tx 



Fig. 38. Green Turtle. 



a substitute for oil and butter, except "when pervaded by a musk-like 

 odour, when it is employed in embrocations, in tanning leather, or 

 in lamps. The eggs of nearly all the Turtles are valuable as human 

 food. Finally, the carapace of several species constitutes a valuable 

 material much employed in the arts, and known as tortoise-shell. 

 This is sought after in consequence of its hardness, the fine polish 

 it is susceptible of receiving, and also for the facility with which it 

 is worked. It has a strong resemblance to horn, but is easily dis- 

 tinguished from it. It is formed of parallel fibres, and seems to 

 be the result of the exudation of solidified mucus. Its texture is 



