It is to be observed that the Merchant Shipping Act nowhere deals with charges on freight. They were long before the passing of the Act securities well known in the shipping world, and of ordinary occurrence. And the right of a mortgagee in respect of freight had also been long settled and well recognised. But it was not thought fit to provide by that Act either with respect to the priorities of charges on freight, or with respect to the rights of mortgagees to freight. These were left to be dealt with according to the ordinary principles of law and equity, and the rules and doctrines established by the decisions of the Courts.