NATURAL SCIENCES OF PHILADELPHIA. 45 



The speaker was of the opinion that, as a principle, it was capa 

 ble of interpreting much of the skeleton. He had reason to be- 

 lieve, that, the bilaterality of centres of ossification (Serres) so far 

 as they apply to the neural and heamal axes (vertebral column 

 and sternum) being assumed, all other arrangements of the 

 scleral tissues were about " centres of nutrition." The costal series 

 (inclusive of the clavicles), with its multiple segmentations and 

 occasional actinapophyses; and more especially the infra-cranial 

 arches (the branchial (hyoid), mandibular apparatuses), were held 

 to be parts of a system similar to the above in kind. 



On favorable report of the Committees, the following papers 

 were ordered to be printed : 



1872.] 



