JO 



PROFESSOR PATERSON, 



fused with the lateral borders of the sternum, and are not united 

 to it by a fibrous lamina. The first costal cartilage is also, as a 

 rule (81"3 per cent.) continuous with the pre-sternum. Occa- 

 sionally on one side or both the union is fibrous. 



The condition of the seventh and eighth costal cartilages has 

 been particularly noted. It is not uncommon- for the pair of 

 seventh cartilages to articulate together in front of the sternum 

 (34 cases — 14-4 per cent.). (In still fewer cases the same occurs 



Table V. — Sejjaration of Sternal Elements and Costal 



Cartilages. 



with the sixth costal cartilage.) In 8 per cent, of the cases the 

 seventh cartilage fails to reach the sternum on one side or both. 

 On the other hand, the eighth cartilage on one side or both is 

 connected with the sternum in still fewer cases (4-8 per cent.). 

 In rare cases, the 5th, 6th, or 7th cartilage reaches on one side 

 to the middle line of the sternum, its distal end pushing its way 

 forwards through the body of the sternum. 



(E) SJiape of the meta-sternum. — Out of 189 cases, the meta- 

 sternum is present in 182 (96-3 per cent.) ; absent in seven 

 instances (S'T per cent.). I have been as careful as possible to 

 discard all examples in which there was the slightest indica- 

 tion that the meta-sternum had been accidentally lost in 

 maceration. 



