Volume 1

The tannins : a monograph on the history, preparation, properties, methods of estimation, and uses of the vegetable astringents with an index to the literature of the subject / by Henry Trimble.

  • Trimble, Henry, 1853-1898.
Date:
1892-1894
Catalogue details

Licence: Public Domain Mark

Credit: The tannins : a monograph on the history, preparation, properties, methods of estimation, and uses of the vegetable astringents with an index to the literature of the subject / by Henry Trimble. Source: Wellcome Collection.

    63/182 (page 57)
    extracting, or else acetic ether instead of lead acetate was recognized as a better agent for purification. The investigations of this period refer chiefly to the composition and constitution of the oak tannin, although the methods of preparation are incidentally considered. Those most prominently identified with the work, commencing in the year 1880 and extending to the present time, have been E11 i, Lowe, and B o 11 i n- ger. Procter has been engaged particularly on the reactions and methods of estimating this as well as many other of the tannins, and has been especially successful in perfecting this branch of the subject. The history of the oak tannins during this period naturally brings us to the present knowledge of the subject, which may be appropriately summed up here, although it must again be frequently referred to in the separate chapters on their preparation and their com- position. The three authors, E11 i, Lowe, and B 61- tinger, have differed so widely among themselves, that at present it is impossible to harmonize their results. Etti and Lowe both worked on the subject in 1880, but the publications of the latter do not appear until 1881. They, therefore, conducted their first in- vestigations without criticism of each other, and, perhaps, without either knowing that the other was engaged in this work. Etti continued his investigations, and published further results in 1883, 1884, and 1888. In his first communication in 1880 he made an important depart- ure in the preparation of the tannin, by using a very dilute alcohol for extracting, and then separating the