| OLOF EDLUND Antiquarian Bookseller STOCKHOLM | ![]() |

| $ 1500 |
| First edition. In 1836, Schwann identified pepsin as a "ferment" that induced digestive changes in albuminous foodstuffs. "Beaumont had considered that the gastric juice contained some other active chemical substance besides hydrochloric acid. Schwann proved this to pepsin."(G&M). |
| * Garrison & Morton 990-1 & 1260. Norman 1913. |