THE DETERMINATION OF HYDROGEN IONS

W. MANSFIELD CLARK
1929 American Journal of the Medical Sciences  
who then stated that it is not methylene blue which penetrates Valonia, but a lower homolog of this dye. Since Irwin used an impure sample of methylene blue, the writer suggested (3) that among other causes, Irwin's results were due to this factor. In a recent paper (J. Gen. Physiol., 14, 19, 1930) Irwin concludes that her results were due to the impurity in the dye which she used. 1 M. M. Brooks, Amer.
doi:10.1097/00000441-192901000-00018 fatcat:xwookbpfl5hb3pd76mizoay6hy