Abstract
Numbers are given of various Acarina extracted from peat and mineral soils, using a flotation method developed by Hale (1964) for Collembola. Comparing the Hale flotation method with the high gradient extractor (Macfadyen 1961) it is estimated that for the recovery of Acarina the latter is twice (or 200%) as efficient with the peat soil used, and 3 1/4 times (325%) as efficient with the mineral soil used in the experiments. These differences were significant as P<0.01 for peat, and at P< 0.001 for mineral soil.

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