Examination of samples received in 1947 and 1948 showed that a subepidermal mycelium occurred in normal wheat grains from almost all the wheat-growing areas of the world. The amount of mycelium varied widely: there are indications that the degree of infection is dependent on the atmospheric humidity during the ripening of the grain. No subepidermal mycelium was found in wheat grains from some crops grown under irrigation. (P < 0'001).* Investigations in 1948 on Bers6e wheat at Slough and on a number of varieties at Heston had shown that it is at this comparatively late stage, namely, after the ears have turned yellow and the grains begun to dry out, that the subepidermal fungi are first seen.

She reported that this fraction decreased during storage and also ' when the fruit is left to mature on the tree '. In the present results there is a similar trend, which is particularly noticeable with the apples from D 3. The first two picks have a residue of 26°/0 which falls to I . S~~ in 4 weeks, and then remains more or less constant.If the well-known major changes in starch and acid are ignored, and also the marginal changes in some organic substances, it appears that the only constituents investigated in the present series of analyses which are consistently changing in concentration with time at or around picking date, are calcium and sodium. There may be small changes in concentration of other elements depending on season, but, on the whole, figures for mineral composition will not he seriously affected by differences of one or two weeks in date of picking.

No abstract

Examination of samples received in 1947 and 1948 showed that a subepidermal mycelium occurred in normal wheat grains from almost all the wheat‐growing areas of the world. The amount of mycelium varied widely: there are indications that the degree of infection is dependent on the atmospheric humidity during the ripening of the grain. No subepidermal mycelium was found in wheat grains from some crops grown under irrigation.

No abstract