IN 1923 a short paper by McLeod was published in the Transactions of the Faraday Society, in which a simple relation between density and surface tension was disclosed, namely:
The Parachor and Valency.
By Dr. Samuel Sugden. (Twentieth-Century Chemistry Series.) Pp. vii + 224. (London: George Routledge and Sons, Ltd., 1929.) 12s. 6d. net.