Note: - "From the Transactions of the Cambridge Philosophical Society, vol. X, part II."
- ULL copies are from the library of Augustus De Morgan. Copy at [DeM] L⁰ (B.P.42) has his note on t.p. ("Recd. Sept.r 6, 1859") and light pencilled annotations.
- ULL copy at [DeM] L0 (B.P.41) is no. 3 in bound vol. of 10 tracts, chiefly by De Morgan, 1859-1869.
- ULL copy at [DeM] L⁰ (B.P.42) is no. 8 in bound vol. of 10 tracts by De Morgan, 1847-1863.
- DOI: 10.1163/9789004460409_MOR2-b29497887