XI PHENOMENA OF ORGANIC NATURE 323 
animals to one another. The horse is a very well- 
defined matter-of-fact sort of animal, and we are 
all pretty familiar with its structure. I dare say 
it may have struck you, that it resembles very 
much no other member of the animal kingdom, 
except perhaps the zebra or the ass. But let me 
‘ask you to look along these diagrams. Here is 
the skeleton of the horse, and here the skeleton 
of the dog. You will notice that we have in the 
horse a skull, a backbone and ribs, shoulder-blades 
and haunch-bones. In the fore-limb, one upper 
arm-bone, two fore arm-bones, wrist-bones (wrongly 
called knee), and middle hand-bones, ending in 
the three bones of a finger, the last of which is 
Sheathed in the horny hoof of the fore-foot : in the 
hind-limb, one thigh-bone, two leg-bones, ankle- 
bones, and middle foot-bones, ending in the three 
bones of a toe, the last of which is encased in the 
hoof of the hind-foot. Now turn to the dog’s 
skeleton. We find identically the same bones, but 
more of them, there being more toes in each foot, 
and hence more toe-bones. 
_ Well, that is a very curious thing! The fact is 
that the dog and the horse—when one gets a 
Took at them without the outward impediments of 
the skin—are found to be made in very much the 
‘Same sort of fashion, And if I were to make a 
transverse section of the dog, I should find the 
Same organs that I have already shown you as 
forming parts of the horse, Well, here is another 
Y 2 
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