Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

GROUP XII

Online Encyclopedia
Originally appearing in Volume V21, Page 351 of the 1911 Encyclopedia Britannica.
» Make a correction to this article.
» Add information or comments to this article.
Spread the word: del.icio.us del.icio.us it!

See also:

GROUP XII . Tannic See also:Acid.—Tannic acid is See also:present in small quantities in the See also:great See also:majority of See also:plants, but in notable quantity in See also:gall-nuts, See also:oak bark, bearberry leaves, See also:rhatany See also:root, See also:catechu, kino, red See also:gum, bael See also:fruit, See also:logwood and See also:witch See also:hazel, all of which are largely used as medicines. In these the variety of tannic acid is not exactly the same, but although there are slight chemical See also:differences, they all possess the See also:power of tanning raw hides and of pre-serving albuminous tissues. The See also:action of tannic acid is strictly See also:local, and depends upon its power of precipitating albumen and of destroying germs. It thus acts as an astringent on all mucous membranes. After absorption into the See also:blood it loses this effect, as it is partly broken up into gallic acid and partly combined with alkalis, both of which changes nullify its action upon albumen.

End of Article: GROUP XII

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click, and select "copy." Then paste it into your website, email, or other HTML.
Site content, images, and layout Copyright © 2006 - Net Industries, worldwide.
Do not copy, download, transfer, or otherwise replicate the site content in whole or in part.

Links to articles and home page are always encouraged.

[back]
GROUP XI 		[next]
GROUP XIII

Site © 2006 - Net Industries