Institutes taking part in the collaborative experiments already reported forwarded samples of the soils employed in the tests to the Forest Products Research Laboratory, England. The soils were then autoclaved sterilised under uniform conditions and sent to the Department of Forest Soils, the Royal College of Forestry, Stockholm, Sweden. The results of the soil analyses are given in Table 1, together with the per cent weight losses recorded by the individual Institutes for untreated test blocks buried in unsterile and sterile soils respectively. An analysis of variance has been carried out on the full table of weight loss data and the results are given in Table 2. An analysis of variance was also carried out on the data from a group of four Institutes that statistically appeared to constitute a different population. The results of this analysis are given in Table 3. F tests of significant difference were made on each of Tables 2 and 3 and the results of these are given at the foot of the respective tables.

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