Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 26. 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Fig. 30. 
Fig. 31. 
Fig. 32. 
Fig. 33. 
Fig. 34. 
STRUCTURE AND DEVELOPMENT OF BONE. 139 
From rickety bone. a. Lacunal cells, h. A detached granular cell in 
process of conversion into a lacuna. 
Longitudinal section of developing bone from the tibia of a calf, mounted in 
Canada balsam, a. Intercolurnnar tissue, from which the lacunal cells 
have disappeared, h. Ossified intercolurnnar tissue and lacunal cells, 
c. Space produced by absorption, d. Haversian system in process of 
formation. 
Transverse section of same, taken at level of h in fig. 24 . a. Intercolurnnar 
tissue, h. Ossified lacunal cell. c. Secondary bone. 
Arrangement of cells and fibres in the neighbourhood of developing parietal 
bone. 
PLATE IX. 
Advancing spicula of bone, from parietal bone of foetal lamb. a. Developed 
bone, showing its cellular character, h. Osteal cells arranged around the 
bone previous to their calcification. 
From the epiphysis of the long bone of a calf, showing osteal and lacunal 
cells. 
From the parietal of a human foetus, showing osteal and lacunal cells, occu- 
pying the space betwixt two advancing spiculge of bone. 
Longitudinal section of cartilage with epichondrium attached, a. The 
developed cartilage, h. Fibres of perichondrium, with cells of a similar 
character to those of the cartilage. 
Circumferential laminae of human tibia, showing the manner in which the 
laminae are developed from osteal cells, h. A compound cell, the origin ? 
of the osteal cells. 
From the tibia of a foetal lamb. a. Dev’^eloped bone, showing the cellular 
character, h. Undulating lamina in process of development, and con- 
taining lacunal cells, c. Osteal cells, not yet arranged. , At is shown an 
Haversian space, enclosed in the advancing ossification, while at e the 
laminm are approaching towards one another to enclose a space. 
From the fibula of a calf, showing growth on the external surface. 
From an inflamed femui-, showing absorption, with the cells contain-ed in 
the Haversian space. 
