Pollen-Slide Studies

This is a small monograph consisting of a brief description of the technic of pollen counting, day by day pollen and spore counts of Washington, D. C., for two seasons, drawings and microphotographs of the pollen and several of the spores encountered in that area, a brief description of these pollens and a short discussion of weather factors with respect to pollination. This volume should be useful to allergists and allergy technicians in the area represented by the District of Columbia but will not satisfy workers in California, Louisiana, Ohio, Arizona and most of the other parts of the country. Over 20 pages of tabular material concerning day by day pollen and spore counts exclusively for Washington, D. C., during 1938 and 1941 cannot possibly be of great interest to those in the country at large. Although the drawings and microphotographs are of fair quality, it is difficult to justify