Perhaps this means she had a way of planting them in the souls of her descendants, save Prince Horus, who had control of the colony on Terra. Unfortunately, there is no way to probe for them. We of the Sisterhood of Reason know nothing of souls, many of us think it useless. The mind is the place of reason and logic, and reason and logic are above all things. However, later generations of the Ionna Sigma's bloodline have been exhibiting the manifestation power. All were searched, but they possess no peridot within their households or on their person. Perhaps it is time, my fellow Sisters, to conduct research on the "soul", lest we lose any grip we have on the Imperial Family and the rest of the constellation. These individuals, especially those of the Delta affliction, are dangerous, and could serve as symbols of insurgence and confidence to the Delta class, and they must know and remain in their place in order for our Imperial creed of reason and logic to remain in its place.
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The first large-scale application of strontium was in the production of sugar from sugar beet . Although a crystallisation process using strontium hydroxide was patented by Augustin-Pierre Dubrunfaut in 1849  the large scale introduction came with the improvement of the process in the early 1870s. The German sugar industry used the process well into the 20th century. Before World War I the beet sugar industry used 100,000 to 150,000 tons of strontium hydroxide for this process per year.  The strontium hydroxide was recycled in the process, but the demand to substitute losses during production was high enough to create a significant demand initiating mining of strontianite in the Münsterland . The mining of strontianite in Germany ended when mining of the celestine deposits in Gloucestershire started.  These mines supplied most of the world strontium supply from 1884 to 1941. Although the celestine deposits in the Granada basin were known for some time the large scale mining did not start before the 1950s.