London: Royal Society of London, 1869. Hardcover. First Edition. iv, v, , , 28, -812 pp. 4to. Library binding, tan leather spine with gold embossed titling. Interiors clean, ex-library stamp on title page, and occurring sporadically within. Numerous folding plates that illustrate articles. Pages were trimmed slightly when rebound. Very Good.
Thomas Andrews' (1813-1885) paper explaining his discovery of the "critical point," the temperature above which no gas can be liquified by any pressure.
Also contains J. Norman Lockyer's "Spectroscopic Observations of the Sun. -- No. II" (pp. 425-444).