102 



BOXE. 



tlio granular osteoblastic cells which succeed tliem. On tlie other hand, Loven* 

 has suggested, and, as it would seem, with more probability, that the osteoblastic 

 corpuscles properly belong to the vascular processes of the sub^jeriosteal tissue, 



Fig. 01, A. 



Fig. 61, B. 



Fig. 61. — A AND B REPKESEXT Two Traksverse Sections of Growing Bone, as 

 IN Fig. 58, but much more magnified (about 120 diameters). 



They show the lateral coalescence of the primary bony areolte and the thickening of the 

 sides of the enlarged cavities by new osseous deposit. The section A is made almost im- 

 mediately below the surface of ossification ; B, is somewhat lower, and shows tlie cavities 

 still more enlarged and their sides more thickened than in A. The new osseous lining is 

 transparent, and apjicars light in the figures ; the dark ground within the areolre is owing 

 to opaque debris, which collected there in grinding the sections. It must be further ' 

 noticed that the letter A within the larger figure, marks a place where a bony partition 

 had been accidentally broken away, for the large space was naturally divided into two. 



which, as already stated, penetrate the newly fomied bone and spread throughout 

 its cavernulated structure. The excavation and removal of the cartilage, as well 

 as the partial absorption of the walls of the bony cavities, is no doubt effected by 

 this tissue, and the abundant osteoblastic cells which appear in it are most 



* Studier och Undersokninirar ofver Benviifuaden, Stockholm. 1863. 



