Further Observations on the Medicinal 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

Further Observations on the Medicinal 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