Modern medicine : its theory and practice, in original contributions by American and foreign authors . ion of samples of airtaken there during hay-fever time, but these investigations led to noresults. HAY FEVER 607 In 1902 the writer observed a thick cloud of dust over fields of blossomingrye, and found that it was formed of rye pollen. That suggested the investi-gation directly of blooming grasses and stalks of rye. As a matter of interestit may be mentioned that in preceding years competent botanical judgeswere consulted about how to collect plant pollen in large amounts, and itwas advised
Modern medicine : its theory and practice, in original contributions by American and foreign authors . ion of samples of airtaken there during hay-fever time, but these investigations led to noresults. HAY FEVER 607 In 1902 the writer observed a thick cloud of dust over fields of blossomingrye, and found that it was formed of rye pollen. That suggested the investi-gation directly of blooming grasses and stalks of rye. As a matter of interestit may be mentioned that in preceding years competent botanical judgeswere consulted about how to collect plant pollen in large amounts, and itwas advised to spread linen sheets over blooming meadows. The writerwould have arrived at this end much earlier if he had known of the researchesof Elliotson and Blackley. Unfortunately, as nowadays nearly alwayshappens, he had contented himself with an examination of the recent litera-ture only and learned of the valuable experiments of these authors withgrass pollen after the final conclusion of the researches to be author was of the opinion that one could arrive at safe conclusions in Fig. 25. Blossoming rye. reference to the cause of hay fever only if it were possible to separate thisagent completely from foreign admixtures, especially from bacteria, and ifone could produce all the symptoms of hay fever by this agent, independent oftemperature and ^veather conditions, and especially of any particular season,and if finally the proof could be elicited that the agent acts only on those per-sons who are stihject to hay fever, and produces absolutely no symptoms inother persons. By means of the pollen of grass blossoms it was possible to produce all thesymptoms of hay fever in hay-fever patients. The same material wascompletely inactive toward normal persons. The pollen first obtained was,however, not bacteria-free. This was obtained by bringing the plant stalks,best of rye and corn, into the laboratory at a time when the yellow anthershad not yet appeared (Fig. 25) and placin
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