# 41 Extinction on termination of necessity
An easement of necessity is extinguished when the necessity comes to an end.
Illustrations
A grants B a field inaccessible except by passing over A's adjoining land. B afterwards purchases a part of that land over which he can pass to his field. The right of way over A's land which B had acquired is extinguished.
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THE EXTINCTION, SUSPENSION AND REVIVAL OF EASEMENTS
37
Extinction by dissolution of right of servient owner38
Extinction by release39
Extinction by revocation40
Extinction on expiration of limited period or happening of dissolving condition42
Extinction of useless easement43
Extinction by permanent Change in dominant heritage44
Extinction on permanent alteration of servient heritage by superior forceLawyer's Registry
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