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By pricking the end of the finger with a needle, we can obtain a drop of blood for examination. Place it on the slide, cover with a glass, and put it under a microscope. The red disks will be seen to group themselves in rows, while the white disk will seem to draw apart, and to be constantly changing their form. After gradual evaporation, the crystals may be seen.

Blood Crystals

By pricking the end of the finger with a needle, we can obtain a drop of blood for examination. Place…