The limb surviving, you may swear,
Becomes his brother's lawful heir:
Thus, for a trial, let me beg of
Your reverence but to cut one leg off,
And you shall find, by this device,
The other will be stronger twice;
For every day you shall be gaining
New vigour to the leg remaining.
So, when an eye has lost its brother,
You see the better with the other,
Cut off your hand, and you may do
With t'other hand the work of two:
Because the soul her power contracts,
And on the brother limb reacts.
But yet the point is not so clear in
Another case, the sense of hearing:
For, though the place of either ear
Be distant, as one head can bear,
Yet Galen most acutely shows you,
(Consult his book _de partium usu_)
That from each ear, as he observes,
There creep two auditory nerves,
Not to be seen without a glass,
Which near the _os petrosum_ pass;
Thence to the neck; and moving thorough there,
One goes to this, and one to t'other ear;
Which made my grandam always stuff her ears
Both right and left, as fellow-sufferers.
You see my learning; but, to shorten it,
When my left ear was deaf a fortnight,
To t'other ear I felt it coming on:
And thus I solve this hard phenomenon.
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