immovable property, of lands and houses, from the living to the living, are transactions which are in their nature either public and notorious, or such as cannot be long concealed. Such transactions, therefore, may be taxed directly. The transference of stock, or movable property, from the living to the living, by the lending of money, is frequently a secret transaction, and may always be made so. It cannot easily, therefore, be taxed directly. It has been taxed indirectly in two different ways; first, by requiring that the deed containing the obligation to repay should be written upon paper or parchment which had paid a certain stamp-duty, otherwise not to be valid; secondly, by requiring, under the like penalty of invalidity, that it should be recorded either in a public or secret register, and by imposing certain duties upon such registration.