After a bountiful lunch in our carriage, we walked to the Sphinx, and saw that face, sadly mutilated now, but still with an expression of cheerful courage, which has looked across these dreary wastes under the midnights and the noons, while men have come and gone like shadows, and kingdoms have been born and fallen to decay. The body of the Sphinx is the natural rock, here and there adapted by a little carving, or the addition of masonry, and is one hundred and forty feet in length. The head is carved out of the solid rock, and measures thirty feet from brow to chin, and fourteen feet across. The Sphinx is merely a ruin of what he was when sacrifices were offered on the altar between his lion paws of fifty feet in length. And yet he makes an overpowering impression of majestic repose, and is worthy of the name given him by the Arabs—the Father of Terror, or Immensity. [To be continued.] APPLICATIONS OF PHOTOGRAPHY. It is naturally impossible to give even an outline of all the many and varied applications to which photography can be and has been applied. In this article it is proposed to give a few of them, more for the sake of informing the student what has been done, than for teaching him the practical method of working them. The method of securing the automatic registration of barometers, thermometers, and magnetometers should command our attention first. It will be necessary to divide these into two classes which require different treatment. A mercurial thermometer may be taken as the representative of the first class. Supposing we have a darkened chamber, in the side of which is a slit of just sufficient dimensions to allow the bore of the capillary tube to fill it, and that light can only have access to that chamber after passing through that slit when so closed, it is manifest that if a strip of sensitive paper be caused to pass gradually behind such a thermometer tube the different height of the mercury will be registered, owing to the opacity of that fluid to light. If the supply of paper be properly regulated it is also manifest that the height of the mercury at any particular instant will be known. Since daylight is not always available, resort must be had to artificial light to impress the sensitive paper, and a suitable process of development employed.