My uncle raised his spectacles, took up a strong lens, and carefully examined the blank pages of the book. On the front of the second, the title-page, he noticed a sort of stain which looked like an ink blot. But in looking at it very closely he thought he could distinguish some half-effaced letters. My uncle at once fastened upon this as the centre of interest, and he laboured at that blot, until by the help of his microscope he ended by making out the following Runic characters which he read without difficulty.

“Arne Saknussemm!” he cried in triumph. “Why that is the name of another Icelander, a savant of the sixteenth century, a celebrated alchemist!”

I gazed at my uncle with satisfactory admiration.

“Those alchemists,” he resumed, “Avicenna, Bacon, Lully, Paracelsus, were the real and only savants of their time. They made discoveries at which we are astonished. Has not this Saknussemm concealed under his cryptogram some surprising invention? It is so; it must be so!”