866. Assignment of after-acquired property.

Personal chattels which, at the date of the assignment, are either not in existence or not the grantor's property, are not assignable at common law1, unless the grantor already has a potential property in them as present owner or possessor of that which is expected to produce them2. Thus, it has been held that an assignment purporting to convey all chattels which are or will afterwards be in the grantor's house does not pass the property in chattels which the grantor acquires subsequently