On aniline and its derivatives : a treatise upon the manufacture of aniline and aniline colours / by M. Reimann to which is added, in an appendix, "The report on the colouring matters derived from coal tar, shown at the French Exhibition, 1867." By A.W. Hofmann ; the whole revised and edited by William Crookes.

Date:
1868
Catalogue details

Licence: Public Domain Mark

Credit: On aniline and its derivatives : a treatise upon the manufacture of aniline and aniline colours / by M. Reimann to which is added, in an appendix, "The report on the colouring matters derived from coal tar, shown at the French Exhibition, 1867." By A.W. Hofmann ; the whole revised and edited by William Crookes. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    12/210 (page 8)
    the reactions are effected in a platinum crucible or in a reverberatory furnace. In some cases, however, it is not unimportant; hence it would be foolish always to expetf: the same result from the crucible as from the furnace, and a well trained judgment will observe the difference in these particular cases. Practical Chemistry, as exemplified in chemical manu- facture, must always be in advance of the science, because in praaice so much attention and energy is brought to bear on one point to produce a given result; it is the funaion of abstraa scientific Chemistry to investigate the progress made, and to correlate the new observations with those previously known. Practical Chemistry can only advance by paying full regard to theory, and Scientific Chemistry can only progress by devoting proper attention to praaice. In the following Treatise I have endeavoured always to maintain a proper relation between praaice and theory. Regarding the former as the pioneer of the science, I have treated in the first place of the purely empirical methods of manufaaure discovered by aaual experience, and have then proceeded to develope theoretical remarks. Where theory has prepared the way for praaice, I naturally give theory the preference, but in all cases theoretical speculations have been limited to those most important and really useful in praaice. As regards the arrangement of the Treatise I simply follow the process of manufaaure. The distillation of tar has been passed over very briefly, because in most cases it is not effeaed by aniline manu- faaurers. The proper territory of aniline produaion is only entered with the manufaaure of nitrobenzol. M. REIMANN.