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January 19, 1924


JAMA. 1924;82(3):227. doi:10.1001/jama.1924.02650290057029

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To the Editor:  —The value of the glycerin microscopic slide for the trapping and identification of air-borne pollen has long been known. I have also found this device of value in the handling of difficult chronic, nonpollen types of hayfever and asthma, especially those sensitive to animal hairs. The glycerin traps not only pollen and inorganic dusts, but also hair, fine feather particles, and fibers of wool, silk, cotton and linen, all of which can be easily identified microscopically with a little practice. They will be found unexpectedly at times in excessive quantity under conditions in which their absence seems so certain as to make them an inconsequential factor. If the slides are stained with compound solution of iodin, unsuspected pollen granules also will be found, if present. If the slides are set out in a patient's room or on the window sill for twenty-four hours, the comparative presence or

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