"a vane blown with all winds;..."
See in text (Act III - Scene I)
That is, a weather vane that simply rotates as the wind blows, with no direction or purpose.
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"And salt too little which may season give
To her foul tainted flesh!..."
See in text (Act IV - Scene I)
That is, there is not enough salt, which is a seasoning, to make Hero palatable.