Abstract
Summary An empirical chemical method for the detection of facial eczema toxicity in pasture is described. Most pasture samples collected from 7 areas over 1-3 autumns showed good correlation between this test and toxicity as assessed by guinea-pig feeding. The substance which is the basis of the test is not the facial eczema poison. Samples from 6 other areas which did not produce toxic pasture did not give positive chemical tests. Of 35 pure species of plants similarly tested only Mentha and related species, especially pennyroyal, gave spurious chemical tests.
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