Principles of insecticide action on mushroom cropping: incorporation into compost

A series of cropping experiments has demonstrated that mushroom yields show an approximate logistic response to a range of insecticide concentrations incorporated in the compost. This principle applies only to the cumulative yield at any flush, and the response of an individual flush is, therefore, related to the difference between two logistic curves. Increases in crop can thus occur in later flushes, partially compensating for earlier losses. With diazinon treatments, but not thionazin, some of this compensation was due to increases in the size of mushrooms. It is concluded that commercial applications of 50 ppm diazinon could cause up to 2–5 % reduction in crop and that 10 ppm thionazin may cause a 6% loss which must be weighed against the advantages of treatment. Suggestions are made for the design and interpretation of future trials.     

Intelligence and educational level in relation to body mass index of adult males.

In this study we explore the relationships between intelligence test score, educational level, and degree of body fatness. We collected data on intelligence test score, educational level, height, and weight from a sample of 26,274 young Danish men and computed body mass index (weight/height2) as a measure of fatness. Both intelligence test score and educational level had maximum values below the median for body mass index and declined monotonically thereafter. The decline was equal for test score and educational level and above 32 kg/m2 corresponded to almost half a standard deviation. These results are not readily explained by stigmatization of frank obesity, and other mechanisms, possibly genetic, may be responsible.