Published online by Cambridge University Press: 11 May 2009
The present paper is a continuation of the work already published under the above general title and should be considered in relation to the results previously recorded. The method of performing the measurements remained unchanged; xylenol blue was used to check the determinations made with cresol red in the more alkaline regions—namely, around pH 8.24. The water was tested immediately after being drawn, or within a few hours, unless otherwise stated in the tables.
* Journ. Mar. Biol. Assoc., Vol. XII, No. 4, pp. 717–771, 1922, and Vol. XIII, No. 1, pp. 93–118, 1923.