became Professor of Chemistry in the same university. Direct ancestors of these Gregorys had been professors of history, astronomy, and mathematics at Edinburgh, Oxford, and St. Andrews. Within a century and a half the family furnished sixteen professors to British universities, and it is a curious coincidence that the Church of Rome likewise counts sixteen Gregorys among its Popes.
It does not appear that the Gregory of powder fame ever published any special recommendation of his compound. He wrote a "Conspectus Medicinæ Theoreticæ" (1788) but the formula for his powder does not appear in that book. Annexed is a facsimile of one of Dr. Gregory's prescriptions for his powder. He gave this prescription very frequently, but occasionally varied the proportion of the ingredients.
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Facsimile of Dr. Gregory's Prescription.
Hiera Picra.
A medicine with this familiar name can be bought in any chemist's shop in Europe or America to-day,
