Take as much turpentine as you please and put it into a retort. Distill it by degrees. When all is distilled off, keep the retort still in a reasonable heat so that what humidity is still remaining may be evaporated and it become dry. Then take this off from the fire and hold your hand to the bottom of the retort. The turpentine that is dried (which is called colophonia) will crack asunder in several places, and in those cracks or chaps you shall see the perfect effigies of fir trees which will there continue many months.
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