Note 148 — PHARMACOLOGIA. ON THE OPERATIONS OF MEDICINAL BODIES, AND ON THE CLASSIFICATIONS FOUNDED ON THEM.
Reading edition
When tannin is present in grasses, as Sir H. Davy found in that of aftermath crops, it is voided in the excrement by animals who feed upon it, together with the bitter extractive, saline matter, and woody fibre. (Elem. of Agricult. Chem. Appendix, p. lxi.) We may therefore infer by analogy that it does not enter into the circulation.