Bcvdo'pment of Bone. 21 



2. 14. Ossification of Bone.— Section of the femur and tibia— 

 in spirit — from a young pig which had been fed on madder for 

 six weeks before it was killed. 



The last- formed portions of bone are stained pink. Thus 

 the new deposit is seen at the epiphysial end of shafts, slightly 

 under the periosteum, and just perceptibly below the articular 

 cartilage of the femur and tibia at the knee. 



B. C. 1. X. 29. 



2. 15. Growth of Bone. — Section of the femur of a young pig 

 which had been fed on madder — macerated and dried. 



On the outer aspect a faint pinkish stain is seen over 

 the whole bone. In the interior the centre of the shaft is 

 white, but the epiphysial ends are slightly stained, as are also 

 the interior of the epiphyses, only less so. G. C. 2659. 



1 6. Growth of Bone. — Section of head of a young pig which 

 had been fed on madder. The soft parts are cleared away, 

 except near the nose. 



The madder colouring has faded, but a pinkish tint is still 

 seen in many places. G. C. 2749. 



2. 17. Ossification in Membrane. — Parietal bone of an infant — 



injected with vermilion and in spirit — showing the bony 

 spicules and blood-vessels radiating out from a centre of 

 ossification. W. C. F. 18. 



DEVELOPMENT IN PARTICULAR. 



2. 18. Development of Skeleton. — Skeleton of human foetus, 

 between the third and fourth month — dried — to show the 

 amount of bone- laid down at this period. B. C. 1. N. 86. 



