Osteological Symmetry of the Camel. 535 
The articular lengths of the metacarpus and of the metatarsus 
are identical; as appear to be the articular lengths of the cubitus 
and of the femur. 
The difference of the articular length in the first and second 
bones of each limb is equal to the length of the first pastern of 
the limb. 
In all animals there seems to be a normal locality for the 
entrance of the arteries that nourish the interior of the bones: 
but these arteries being liable to the same variations as the 
tubes that convey the fluids to the less compact substances of 
the body, the distance of the medullary arteries from the joints 
is here unnoted. 
The bones of the atlantal limbs of the Bactrian Camel are, in 
their breadth and thickness, more robust and more symmetrical 
than the bones of the sacral limbs. 
The middle breadths of the atlantal limbs are consecutively, 
9. 9. 6. 4 proportional parts :—Sum 28. 
Their middle thicknesses are consecutively, 
B 0 3 proportional parts :—Sum 18. 
And their middle girths are consecutively, 
30. 26. 20. 12 proportional parts :—Sum 88. 
The middle breadths of the sacral limbs are consecutively, 
7. 8. 5. 3 proportional parts :—Sum 23. 
Their middle thicknesses are consecutively, 
6 5 4 proportional parts :—Sum 13. 
And their middle girths are consecutively, 
22. 20. 17. 10 proportional parts:—Sum 69. — 
So that the thickness of the first pasterns being omitted, the 
sums of the middle breadth, thickness, and girth in the atlantal 
limbs are even numbers of proportional parts ; while the similar 
dimensions in the sacral limbs are odd numbers of these parts. 
VOL. XVI. 3z There 
