As already seen, there can be no remainder without a preceding particular estate; that is, a remainder cannot be limited after an estate reserved to the grantor. The particular estate must be a freehold.30 And the particular estate which is required to support a remainder cannot be created by operation of law. For instance, an heir, in assigning dower, cannot limit a remainder to begin on the termination of the widow's life estate.31as a general rule, there can be no remainder where there can be no reversion,32 though there may be a reversion where there can be no remainder. So there can be no remainder after a fee, except in a few states where the rule has been changed by statute,33 nor after a qualified fee;34 but, as already stated, there may be one after a fee tail.35 If the particular estate on which a remainder depends never takes effect, as where the tenant of the first estate refuses or is not qualified to take, the remainder, if vested, takes effect at once. This is called acceleration of remainders.36