ENDOSRELETOX. ANIMALS. 37 



all growing parts are much more vascular than those that are come 

 to their full growth ; because growth is an operation beyond the 

 simple support of the part : and this is the reason why young 

 animals are more vascular than those that are full-grown." 

 " This is known by injections, when parts are in the growing 

 state, or are just grown, and for some time after." Hunter, On 

 tlie Blood, 4to, 1794, p. 156. 



A. 157. A transverse section of the epiphysis of a cylindrical 

 bone, which exhibits the progress of the vessels from the 

 circumference towards the centre. 0. C. 149. Hnnterian. 



A. 158. A section of the metacarpal bone of a Calf. 0. C. 152. 



Hnnterian. 



A. 159. A similar section of the metacarpal bone of a Calf. 

 O.C. 153. Hnnterian. 



A. 160. A vertical and longitudinal section of one of the toes, 

 finely injected, of a fetal Calf (Bos taurus). It shows the 

 large cartilaginous epiphysis of the metacarpal bone, and 

 the highly vascular ossific centres of the three phalanges. 

 The sesamoid is cartilaginous. 0. C. 133 H. 



Mns. Sir Astley Cooper, Bart, 



A. 161. The pelvis of a (female) mature Human Foetus, showing 

 the radiating disposition of the ossific fibres in the ilium, 

 and the separate points of ossification in the ischium 

 and pubes, and in the bodies and neurapophyses of the 

 sacral vertebrae. The coccyx is still wholly cartilaginous. 

 0. C. 133 A. Presented by IV. If. Cliff, Es<j. 



A. 162. The right femur of a foetal Leopard, showing the carti- 

 laginous epiphysis of the head, the great trochanter, and 

 the condyles. O.C. 133 G. 



A. 163. The femur of a mature Human Foetus, showing the 

 cartilaginous epiphyses ; the superior of which compre- 

 hends the great and little trochanter. 0. C. 133 B. 



Presented by W. II. Clift, 



