530 Dr. Walter Adam on the 



of normal proportion : though still that enlargement has been 

 controlled by the laws of symmetry. 



The greatest breadth is attained at the connection of the 5th 

 with the 6th dorsal vertebra : there the pressure of the burthens 

 has evidently been most severe. The breadth so increased 

 equals the cerebral bulge of the cranium. 



As a further exemplification of strength gained under toil, 



and of disparity in ossification, it may be deserving of notice, 



that the right sides of the caudal margins of the 6th and 7th 



dorsal vertebrae project as a socket over the contiguous rostral 



margins. 



Lumbar Vertebra. 



The lumbar vertebrae diminish in length and in height as 

 they approach the sacrum. 



The transverse processes occupy somewhat of an oval space. 

 The other dimensions of breadth increase towards the sacrum. 



The distance between the extremities of the 1st lumbar ver- 

 tebra is equal to the spinal extent of the last dorsal vertebra, 

 which has been stated to be also equal to the length of the 1st 

 rib, and to the greatest breadth of the head. 



The sum of the differences of the distances between the extre- 

 mities of the transverse processes of the lumbar vertebrae is 

 equal to the sum of the breadths of these vertebrae at the roots 

 of their rostral oblique processes. 



The Sacrum. 



The caudal height of the sacrum is the third of its rostral 

 height: while, again, the rostral height is two thirds of the 

 sternal length, and equal to the caudal height of the cranium. 



The rostral breadth of the sacrum equals the height of the 

 1st lumbar vertebra. The caudal breadth is half the length of 

 the bone over the nerval canal. 



The 



