Abstract
SEVERAL workers1–3 have shown that, in the field, heather (Calluna vulgaris Salisb.) is found most frequently and attains its maximum development on soils the reactions of which are about pH 4. I have examined the germination and the subsequent seedling development of Calluna seeds planted on agar media adjusted to give a range of reactions. A quantity of 1 per cent British agar was prepared with a form of Knop's solution. This was divided equally between nine flasks. The contents of these were adjusted to pH 2, 3, 4, 5, 6, 7, 8, 9 and 10, respectively, by the addition of the requisite quantities of sulphuric acid or caustic soda. After adjustment, the agar in each flask was poured into six 1-in. boiling tubes to give a depth of agar of about 1½ in. The tubes were plugged and the agar allowed to set. A liberal sowing of Calluna seeds was then made in all tubes.
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