Since preparation of Document No: IRG/WP/258 results have been received from the remaining collaborators. Thus there is a little further to add to the conclusions already derived, those in Document No: IRG/WP/251 being as follows: 1) the exposure system used sometimes resulted in excessive weight gains in the sterile check blocks. Consequently the corrected loss in weight of the test blocks could not be accepted as the sole criterion of attack by soft-rot fungi; 2) all the soils produced adequate attack of untreated control material; soils giving high weight losses with one timber did not necessarily give high weight losses with the other; 3) high toxic values are not necessarily accompanied by high weight losses of untreated material; It seems unlikely that preservatives will always show the same ranking, in terms of comparative toxicity, when tested in different soils.

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