This is as far as the investigation has been carried at the present time, April twenty-fifth, but its study is being continued. CONCLUSION The results of this investigation may be briefly summarized as follows: (1) Ortho toluidine may be easily converted into its sulphonic acid in which the sulphonic acid group is in the position meta to the methyl group. (2) Para toluidine is converted into a mixture of two isomeric sulphonic acids of which the one with the sulphonic acid group in the position meta to the methyl group is obtained in a ten per cent yield. (3) Ortho toluidine sulphonic acid may be easily diazotized using sodium nitrite and concentrated hydrochloric acid. (4) The diazo compound is very stable. (5) The diazo compound is easily decomposed with n-butyl alcohol, the hydrogen reaction taking place. BIBLIOGRAPHY In addition to the references made in the thesis itself the following authorities have been consulted for the theoretical discussion: Beilstein, F. C., “Handbuch der organischen Chemie” 1886-1890. Voss, Hamburg. Victor von Richter, “Organic Chemistry” Trans. 1899-1900. P. Blakiston’s, Philadelphia, Pa. B.P.L. 3974.160 Meyer and Jacobson, “Lehrbuch der organischen Chemie” 1893. Veit & Co., Leipzig. B.P.L. 3973.143 [Transcriber’s Note: Table of contents added by transcriber. Obvious printer errors corrected silently. Inconsistent spelling and hyphenation are as in the original.] End of the Project Gutenberg EBook of Meta Toluene Sulphonic Acid and Related Compounds, by Charles Francis Hitchcock Allen