Excerpt from The Boston Medical and Surgical Journal, Vol. 184: May 26, 1921 Late Spring Type. Patients whose hay fever develops in the latter part of May, or during June, should be tested with the pollens of the chief grasses, such as orchard grass, timothy, red-top and certain flowering weeds. Late Summer Type. Patients whose hay fever develops in mid-august and continues until frost, should be tested with the pollens of such weeds as ragweed and goldenrod, the related sunflower, also with the pollens of the one important late flowering grass, viz. Corn, if exposed to same. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.