As he could have rendered all these fears unnecessary by simply taking out the patent, I could not understand why he delayed from month to month, and at last I voiced my suspicion that he was not honest with me and had some unknown designs. I declared that nothing would keep me longer in England, which had become wearisome to me owing to my constant seclusion; and my suspicions were increased by the entire lack of all news from the Gleissners and from my family. When Herr Philip Andre realized that I could be held back no longer, he went to work at last, and in twelve days we had the patent in our hands. As I had trained Herr Philip already in the art of stone-work, there was nothing to keep me longer, and I began my homeward voyage at once with my former companion, Herr Friedrich Andre. My seven months' sojourn in London had the following results for myself and for lithography:-- First, I had decided in Offenbach to use my spare time entirely for the study of chemistry. Particularly did I want to learn everything that was known about color, that I might use stone for cotton-printing. I bought the best books and worked steadily, testing the teachings by experiment. Second, I made many experiments with stone-ink, to find the very best composition. The ingredients which I utilized in course of the time were about as follows:-- Soap--_a_, common tallow soaps; _b_, Venetian soap. B, wax. C, tallow, butter, and other animal fats. D, spermaceti. E, shellac. F, resins and Venetian turpentine. G, gum elastic. H, linseed oil. I, the fat contained in chocolate. L, various resinous products, such as mastic, copal, dragon's blood, gum elemi, quajac pensoe, etc. Then I used various solvents besides the soap, such as-- M, vegetable alkalies, among them tartaric acid. N, similar mineral alkalies. O, animal lyes, spirits of sal ammoniac, and sal volatile with spirits of ammonia. P, borax. Q, various metallic solutions. It is evident that with these substances an endless number of experiments can be made, not to count the variety of proportions. Certainly it is not exaggeration when I say that during that time and later I made many thousands of experiments, only to confirm my experience that accidentally I had discovered the best compositions during the first twenty or thirty investigations, and that my time after that had been wasted, unless I counted the knowledge I had gained of chemistry.