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In order to get a closer insight into the causes of this confused condition of ordinary races, Rimpau made some observations on Rivett's wheat. He found that it suffers from frost during winter more than the local German varieties, and that from various causes, alien seeds may accidentally, and not rarely, become mixed with it.
Eales proposed to come over to the glen and celebrate the Holy Feast in the very early morning before anyone was astir. There were a few of his Bristol flock who would be thankful for the opportunity of meeting more safely than they could do in the city, since at Easter they had as nearly as possible been all arrested in a pavilion in Mr. Rivett's garden which they had thought unsuspected.
Stead lingered about the open stall where the bread was sold till no customer was at hand, and then mentioned under his breath to the good dame his desire to speak with her lodger. "Certainly," she said, but the Doctor was now with his pupils at Mistress Rivett's. He always left them at eleven of the clock, more shame of Mrs. Rivett not to give the good man his dinner, which she would never feel.
Mrs. Rivett's house stood a little apart from the town, with a court and gates opening on the road over the down; and just as eleven strokes were chiming from the town clock below, a somewhat bent, silver-haired man, in a square cap and black gown, leaning on a stick, came out of it.
In the lecture on the selection of elementary species, closely analogous cases were described. One of them was the wild oat or Avena fatua which rapidly supplants the cultivated oats in bad years in parts of the fields. Other instances were the experiments of Risler with the "Galland" wheat and the observation of Rimpau on "Rivett's bearded" wheat.
Any lot of seed exhibits such impurities, as I have had the opportunity of observing myself in sowings in the experimental-garden. But the impurities are only mixtures, and all the plants of Rivett's "Bearded wheat," which of course constitute the large majority, are of pure blood. This may be confirmed when the seeds are collected and sown separately in cultures that can be carefully guarded.
Rimpau has dealt at large with the phenomenon as it occurs in the northern and middle parts of Germany. Even Rivett's "Bearded wheat," which was introduced from England as a fine improved variety, and has become widely distributed throughout Germany, cannot keep itself pure. It is found mingled almost anywhere with the old local varieties, which it was destined to supplant.
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