EXDOSKELETON. ANIMALS. 31) 



patella are injected, but ossification had not yet begun. 

 0. C. 135. Hunterian. 



A. 175. The patella of a Child more advanced in age, in which 

 ossification has begun in the centre, and has extended 

 along the coats of the arteries, making them appear like 

 bony ramifications. 0. C. 136. Hunterian. 



A. 176. A series of three Human patellae of different periods of 

 growth, to show the progress of ossification. 0. C. 137. 



Hunterian, 



A. 177. A section of the astragalus of a young person, exhibiting 

 the reticular cancellous structure of the whole bone, the 

 cancelli being largest in the centre. 0. C. 200. 



Hunterian, 



A. 178. The counterpart o the preceding preparation. O. C. 

 207. Hunterian. 



A. 179. The os naviculare of a young person, longitudinally 

 bisected, to show the cancellous structure nearly uniform 

 throughout the bone. 0. C. 208. Hunterian. 



A. 180. The os cuueiforme internum of a young person, lon- 

 gitudinally bisected, and showing a similar structure. 

 0. C. 209. Hunterian. 



A. 181. The two middle metatarsal bones of a Pig (Stig scroftt), 

 in section. The vascularity is greatest at the spongy 

 extremities. 0. C. 157. Hunterian, 



A. 182. A longitudinal section of the metatarsal bones of a Calf. 

 Along the middle of this preparation may be observed the 

 progress of the ossification, which afterwards produces a 

 complete ankylosis, and reduces the two to a single cannon- 

 bone. 0. C. 154. Hunterian. 



A. 183. A similar preparation ; apparently a section of the 

 preceding specimen. 0. C. 155. Hunterian, 



