Joseph McKenna, Chicago Railway Company v. Sturm…
“ A debt may be as valuable as tangible things. It is not capable of manual seizure, as they are; but no more than they can it be appropriated by attachment without process, and the power to execute the process. A notice to the debtor must be given, and can only be given and enforced where he is. This, as we have already said, is a necessity, and it cannot be evaded by the insistence upon fictions or refinements about situs or the rights of the creditor. Of course, the debt is the property of the creditor ”
