“…Of 13 arrays of thresholds for different decay fungi encountered in the literature, the actual concentrations were positively skewed in 10, while their logarithms showed much less skewness, positive in 6 arrays, negative in 5, and none in 2. The logarithms of the threshold concentrations for the different fungi in the agar trials of Rabanus (1931), Richards (1924Richards ( , 1925, Baechler (1938) and Carswell and Hatfield (1939) agree in general with the wood-block trials of Cowling (1957) and those summarized by Schulze et al (1950) in showing wide scatter for arsenicals, decreasing through the heavy metals to a more moderate range for pentachlorophenol, and relatively narrow ones for sodium bichromate and sodium fluoride, which owe their effect to the anions. As might be expected, mix-tures such as creosote and Wolman salts showed narrower ranges than did some of the single chemicals, though there were rather large differences in reactions to mixtures that contained arsenic.…”