The meaning of the two signs puzzled him, and he wondered why this battery of chemicals was separated so radically from those in glass jars on the shelves of the laboratory proper. “ Custodes ,” “ Custodes ”; that was the Latin for “Guards” and “Material,” respectively⁠—and then there came a flash of memory as to where he had seen that word “Guards” before in connection with this dreadful mystery. It was, of course, in the recent letter to Dr. Allen purporting to be from old Edward Hutchinson; and the phrase had read: “There was no Neede to keep the Guards in shape and eat’g off their Heades, and it made much to be founde in Case of Trouble, as you too welle Knowe.” What did this signify? But wait⁠—was there not still another