549 



The following specimens, to No. 3299 inclusive, are from young Pigs (Sus Serofa) that 

 have been fed on madder for the purpose of illustrating the growth of bone. 



Hunterian. 



3292. The bisected cranium. 



Some portions of the cranium, particularly the internal table, and the fangs of the teeth, 

 still retain the imparted colour ; the other parts have lost much of their former redness by 

 long exposure. 



3293. The right ramus of the lower jaw, longitudinally bisected, of a Pig, once fed 

 with madder and afterwards with ordinary food. 



The dentine of the teeth has become deeply tinged with madder. The last-formed bony 

 substance may still be distinguished from that previously formed, which is stained by the 

 colouring matter. 



3294. The left ramus of the same jaw. 



3295. The left ramus of the lower jaw, the two tibiae, and some of the ribs of a very 

 young Pig, killed whilst under the influence of madder. 



In the experiment which these bones illustrate, the animal had been ' twice fed ' with 

 madder. A section has been removed from the lower border of the jaw, showing the external 

 layer of the bone coloured red. 



3296. The right ramus of the lower jaw, with sections of the right humerus and 

 femur, and left tibia and ulna of a young Pig, which had been thrice fed 

 alternately with madder and ordinary food. 



3297. The left humerus, radius and ulna, and section of the scapula, with the right 

 scapula, and sections of the right humerus, ulna, tibia and fibula, tinged with 

 madder. 



3298. Longitudinal sections of the humerus, femur, and tibia, slightly tinged with 

 madder. Hunterian. 



3299. A tray of teeth, the dentine and cement of which still show the red stain of 

 madder. 



