LAG-LEAD CORRELATIONS OF BAROMETRIC PRESSURE AND BIOLOGICAL ACTIVITY ,

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Abstract
1. Eight species of living things, ranging from lower to higher plants and lower to higher animals, in studies over a three-year period and including approximately 850 species-days have exhibited without exception a statistically significant leadcorrelation on barometric pressure with an over-all mean coefficient of about 0.5. 2. The correlation involved sometimes only the 5-6-7 A.M., sometimes only the 5-6-7 P.M., and other times the mean daily rates of O2-consumption. 3. The sign of the correlation was sometimes positive and other times negative. Sign changes, when they occurred during a single period of study were abrupt, and correlated with a 180°-shift in the phase relationships of the concurrent mean solar-day cycles. 4. In twelve periods of study, ranging from one to four months each, the correlation in nine cases centered on day n + 2 of barometric pressure. In two cases it centered on day n + 1 and in one, on day n + 7.