“There exists in various quarters of the world a peculiar earthly deposit known as Infusorial Earth. This dust is common at Oran in Algeria, in Bermuda, at Richmond, and in Ireland and Elsewhere. In Sweden and Norway similar dust is known as Berg-Mehl or “mountain meal”, and is used to mix with the dough from which bread is manufactured. On examining these earths under the microscope, they are found to consist of collections of fossil Diatoms.”

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