In a recent article, Beebee and Sabbarton-Leary 
argue that even we grant that Kripke successfully 
showed that water is essentially H2O, this line 
of argument cannot be extended to all natural 
kinds. In this paper, I argue that their argument 
is wrong. I argue that their argument is based on 
the idea that an analytic proposition cannot be 
true in virtue of metaphysical essence but this 
idea is wrong. I further argue that the theses 
that analyticity and necessity a posteriori are 
mutually exclusive, which Beebee and Sabbarton-
Leary seems to take for granted, is not something 
we can take for granted.