44. Extinction on permanent alteration of servient heritage by superior force. -An ease ment is extinguished where the servient heritage is by superior force so permanently altered th at the dominent owner can no longer enjoy such easement: Provided that, where a way of necessity is destroyed by superior force, the dominant owner has a right to another way over the servient heritage; and the provisions of section 14 apply to such way. 17 Illustration