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Excerpt from The Mean and Extreme Daily Temperatures in St. Louis for Forty-Seven Years, as Calculated From Daily Observations; The Evolution on the American Trotting-Horse; Magnetic Survey of Missouri, 5th Annual Report: On the Expression of Electrical Resistance in Terms of a Velocity
The observations were made within the city of St. Louis, and can thus not claim precision for this whole region. St. Louis, to be sure, was, when they commenced, a small town of perhaps inhabitants. While now, at their completion, it is a large city of probably with the necessary accompaniment of brick and stone, and especially with the smoke of thousands of chimneys, furnaces and factories, and the almost total absence of verdure. It has been held by some, that these in¿uences had little effect on temperature, but that brisk breezes would soon dis pel smoke and equalize temperature. This, however, is not quite so, and direct thermometrical comparisons prove that the extreme temperatures, and, remarkably enough, even the extreme heat, are less marked in the city than in the country, and that the mean temperature is higher in the city than in the country (trans, vol. Ii., p. But, aside from instrumental observation, the state of the vegetation proves it every spring and fall, when we find in our city gardens the plants uninjured on mornings when in the country they have suffered from late or early frosts.
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