Measurements of SACRUM.  (m) 
Length of five sacral centra  0.95 
Breadth across second pair of sacral ribs  1.05 
Breadth across fifth pair of sacral ribs  0.98 
Height of first sacral vertebra  .64* 
Height of third sacral vertebra  .60* 
Height of fifth sacral vertebra  .53* 
Length of centrum  0.19 
Length of centrum II  0.18 
Length of centrum Ill  0.15 
Length of centrum iv  0.22 
Length of centrum V  0.21 
* Dimension modified by distortion 
 

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