“If there is nothing to show that his vendor has conveyed the land, he presumes that the vendor has not conveyed it, and goes ahead. Clearly, although the Ordinance or, as it should here be called, the Act, does not relate to registration of title, but of instruments, it is plainly intended to give some measure of security and some protection against fraud. When two persons claim the transfer of a legal estate, he who did not register his conveyance cannot plead it or give it in evidence; if they both registered their deeds, each takes effect as against the other from the date of registration; which means that the one executed earlier loses its priority if it was registered later. What counts is the date and hour of registration.”