24 PHYSIOLOGICAL SERIES. 



two inches and ten lines, and the distance between the holes one 

 inch and eight lines. After a certain period the animal was killed, 

 and the length of the bone was found to be three inches seven lines, 

 while the space between the apertures was one inch and eleven 

 lines ; the increase of the bone beyond the points of cauterization 

 being more than double that of the space included between them. 

 [The original note of the experiment is preserved in the bottle.] 

 0. 0. 188. Hunterian. 



A. 80. The sternum, sternal ribs, and scapular arch of a young 

 (Jondor (Sarcorltainplius yi-yphus) \ the sternum with its 

 well-developed keel is formed by one continuous cartilage. 

 Ossification has commenced in the coracoids and scapulae. 

 0.0. 133 E. 



A. 81. The sternum of a Black Swan (Cygnus atratus} 83 days 

 old. 0. 0. 133 E b. 



A. 82. The sternum of a Black Swan (Ci/ynus atratus) 153 days 

 old. 0. C. 133 E e. 



A. 83. A longitudinal section of the ulna of an Owl. The air- 

 cells are not continued into it, its cavity having been filled 

 with medulla. 0. C. 211. Hunterian. 



A. 84. A longitudinal section of the femur of an Owl, which has 

 also had no connection with the air-cells, but contains 

 medullary matter, and exhibits the difference between such 

 bones and those which contain air. 0. 0. 212. Hunterian. 



A. 85. A longitudinal section of the lower part and articular end 

 of the tibio-tarsus of a young Ostrich, with the vessels of 

 the periosteum injected. 0. C. 119 A. 



A. 86. A section of the upper extremity o the tibio-tarsus of a 

 young Ostrich, showing the more compact cellular struc- 

 ture, containing medullary matter ; and the epiphysis. 

 0. C. 218. Hunterian. 



A. 87- A section of the lower extremity of the tibio-tarsus of a 

 young Ostrich, showing the compact cancellous structure, 

 and the medullary cavity. 0. C. 219. 



