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Authors of the article " Interactive effects of ambient ozone and climate measured on growth of mature forest trees " are S. B. Ground-level ozone forms when hydrocarbons and nitrogen oxides in the air react in the presence of sunlight . Interesting experiments are being conducted in the physical and chemical character of marsh soils , in wind power as adapted to agricultural operations , in ascertaining what varieties of fruit trees " are suited to the rigorous conditions of our State , " and in tuberculosis in dairy cows . These " paper pulp trees " are specifically grown and harvested as a cash agricultural crop . Mathematical methods using " decision trees " are being developed to aid in finding more efficient testing strategies so that we can explore more containers without backing up commerce at ports and within a reasonable budget .