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122 and electrical science in a manner greatly in advance of anything that is commonly known; and further that there were certain complicated arrangements of prisms and mirrors which indicated as I thought some use of the agency of light which was quite new to me and which I did not understand. One set of machines proved to be used for the manufacture of the compressed food which we had already found so effective. Another set of much simpler construction carried it away and stored it when made. Yet another set was used for the manufacture of that invisible paint, the use of which had so astonished me. These last were the machines which attracted my curiosity most of all, and which implied not only a use which I did not comprehend of agencies which I recognised, but the existence of other agencies of which I knew nothing at all. I observed, however, as carefully as possible and I made, later on, very full notes of what I did observe, and I shall be happy to communicate these to our men of science in whose hands they can hardly fail to become of much practical value. I need hardly say that I asked a good many questions about this last set of machines, but somehow I got very little information. Whether Signor Davelli was unwilling to explain, or whether there was something in the process which I