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 vertebra project as a socket over the contiguous rostral 
margins. 
Lumbar Vertebra. 
The lumbar vertebre 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 Ist 
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 vertebre is 
equal to the sum of the breadths of these vertebre 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 
ist lumbar vertebra. The caudal breadth is half the length of 
the bone over the nerval canal. 
The 
