Volume 1

Further observations on the medical leech; including a reprint from the Philosophical Transactions of two memoirs, comprising observations on the Hirudo vulgaris, or common rivulet leech; and on the H. stagnalis and H. complanata, now constituting the genus Glossopora / [James Rawlins Johnson].

  • Johnson, James Rawlins, active 1792-1827.
Date:
1825
Catalogue details

Licence: Public Domain Mark

Credit: Further observations on the medical leech; including a reprint from the Philosophical Transactions of two memoirs, comprising observations on the Hirudo vulgaris, or common rivulet leech; and on the H. stagnalis and H. complanata, now constituting the genus Glossopora / [James Rawlins Johnson]. Source: Wellcome Collection.

    25/134 page 9
    sewing thread. These require, as we have since ascertained, a longer time to rear, and are, consequently, not so advantageous as the grey Leeches, which in the course of a few months had increased to, at least, full four times their size. During the month of September, I again collected several of these membranous Bags or Cocoons. Two, which were opened, were found filled with the same gelatinous matter to which I have before alluded, but darker in colour. One, which I preserved at my own residence, was found to be pierced at each extremity; three small Leeches had issued from it—but a fourth, unable to effect its complete deliverance, lay dried up in the very aperture. I have never yet been enabled, notwith¬ standing my frequent endeavours, to ob¬ serve a Leech in the act of fabricating its Cocoon around the gelatinous matter we have found in some, and in which, I think,
    digitised image 1
    digitised image 2
    digitised image 3