The assignor cannot by assigning the benefits of his contract relieve himself from his liability thereon.1 Hence the mere fact of assignment cannot be treated as a breach by the assignor.2 Thus if an assignee of a lease expressly assumes the obligations and liabilities arising under such lease in consideration of such assignment and thereby makes himself personally liable, his subsequent assignment to another does not discharge such liability.3 If, on the other hand, there has been no as< sumption of personal liability, assignment of the lease relieves from liability for rent.4 In some jurisdictions, however, this rule must be qualified by the statement that the assignor becomes the surety for the assignee and ceases to be liable to the adversary party in the first instance.5