Sliver lap, yarn, and fabric made of the same raw cotton of known composition were irradiated with cathode rays under various conditions. Changes in the chemical and physical properties were investigated. Some yarns also were irradiated with gamma rays. The changes that occurred in these samples were found to be the same as those in samples irradiated with cathode rays. Data for the copper number, the methylene blue number, and the intrinsic viscosity indicated that degradation of the cathode ray irradiated yarn had taken place. A new absorption maximum was found in infrared spectrograms of the cotton irradiated at high dose levels. Direct-dye affinity of the
The more common use of aircraft during recent years has enabled various investigators to make collections of microorganisms occurring in the air at various altitudes in widely separated parts of the world. Such studies have been reported in the United States by Stakman, Henry, Curran and Christopher (1923), Brown (1930), and Meier, Stevenson and Charles (1933). In Canada, Craigie and Popp (1928) have collected rust spores from the air and in Russia some microbiological studies in the upper air were made by Mischustin (1926). More recently Meier and Lindbergh (1935) have published the results of collections made by Colonel Lindbergh in extended flights above the Arctic Circle. During the past two years collections of this nature have been made in the vicinity of Boston. This has been possible due to the fact that almost daily airplane flights to relatively high altitudes were being conducted under the direction of the Division of Meteorology, Department of Aeronautical Engineering, of the Massachusetts Institute of Technology. These flights were designed primarily for the purpose of obtaining meteorological data at high altitudes, but through the courtesy of the Division of Meteorology, the same flights have sometimes been used for making collections of air microorganisms. A description of the apparatus and the results of collections made in 45 earlier flights of this nature have been reported previously (Proctor, 1934). The present report deals with the
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