Development and Maintenance. 



are important changes to be otherwise effected. 

 The muscles of the body are small and pale, and 

 the bones (so called) are very deficient in osseous 

 material (earthy salts). A few teeth only are 

 through the gums, and others are lying in 

 different stages beneath in the form of a highly 

 vascular pulp, quite unlike its future self. 



In each there are important changes to take 

 place. 



The bundles of cartilage in the centre of the 

 limbs and beneath the muscles of the body, &c., 

 gradually become harder, and lose their charac- 

 teristic elasticity. Their structure is altered by 

 the deposition of bony material, and by and 

 bye we have the osseous framework or skeleton 

 completed. 



The pale muscular fibres assume greater dimen- 

 sions, and at the same time a darker colour, and 

 power to act more forcibly on the individual 

 bones. 



The tooth pulp within the gums, already pro- 

 vided with innumerable blood vessels and nerves, 

 gradually acquires the shape of a tooth, incisor 

 or molar, its different layers of hard substance 

 variously termed dentine, enamel, &c., and only 

 at a specified time will it appear above the 

 surface. 



At length the animal is " filled up," " made 

 up/" or " furnished/'' in stable phraseology, and 

 the period of youth gives way to that which is 

 known as the adult stage. 



