Published online by Cambridge University Press: 15 May 2009
This paper deals with the result obtained after testing, by the “Dick” method, the susceptibility of a series of adults to scarlet fever toxin. The toxin used was produced by the Wellcome Physiological Research Laboratory. While various strengths of solutions were tried to begin with from 1:2500 to 1:250, no advantage was found to result from the use of a solution stronger or weaker than 1:1000. The tests were, therefore, carried out with the standard “Dick” toxin as supplied by this firm.