When he wished further to know how, and of what ingredients the human blood was made, the old lady laughed, and replied lightly that it was red, and more than that she had not learned from the "Schoolmaster with the Children," from which she had acquired all that she knew. Then the doctor cried: "And so my hard-earned discovery is of less value than I hoped!" But these words had scarcely escaped him before he smiled to himself, for it was the elixir that had forced him to this outbreak, otherwise he would never have confessed to any one, be he who he might, that his wonderful discovery was in any way incomplete. Being satisfied with his experiences for that day he no longer hindered the old lady from going to rest. On his own bed he lay and pondered over the limitations of his discovery. To reveal the truth, wholly and absolutely, was not within the power of the elixir, nor unfortunately did it possess the efficacy to lead one to a perfect knowledge of oneself; on the other hand it was capable of forcing any one who used it to be absolutely honest in his dealings with his neighbours, and that surely was no small gain. Indeed it was enough to place him among the most famous discoverers in all ages, and to inscribe his name beside those of the noblest benefactors of man in the whole round world. Sleepless, yet filled with triumphant joy, like a general who has won a glorious victory, he watched through the night. When Frau Schimmel came to the house on the following morning she found him with the little Zeno between his knees. Her suspicion was immediately aroused that the father had misused the child in order to try the effect of the elixir upon it, and she stood at the door and listened. But the little bottle tightly corked peered from the doctor's breast-pocket and, instead of questioning Zeno, he was talking to him earnestly: "Your mother," he was saying, "was more precious to me than life or aught else, and you, my little one, are dear to me, too, chiefly because it was she who gave you to me, but who knows if I might not have sacrificed you if the success of the work, to which I have devoted so many years, had depended upon it. Now I have reached the goal, and I tell you, my boy, there are only two joys here below so great as to give a foretaste of the bliss that awaits us in Paradise: one is the sweet rapture of true love, and the other, the transport of the inventor when his experiment is successful. I have known both." During this speech, which the doctor had made under the influence of the elixir, the boy stared at his father with open mouth, undecided whether to be afraid, or to consider it all a jest and laugh.