The book The Essentials of Logic was written by author Sellars, Roy Wood, 1880- Here you can read free online of The Essentials of Logic book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Essentials of Logic a good or bad book?
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It will be noted that such comparison involves a near approach to the method of differences. But experiment is impossible. When an average begins to change, the investigator seeks the pres- ence of some new cause or the increase of some cause already operative. " The number of homicides in the United States in 1894 far exceeded the annual num- ber observed for the years preceding. This discrepancy is easily accounted for by the fact that the natural number was swollen by the deaths caused by th...e strik- ers and rioters in the month of July of that year. So also a marked departure from the annual death-rate of such a city as New York is at once an urgent sugges- tion to the Board of Health to start investigations that will unearth the hidden cause that one is constrained to believe must be present. Such causes as defective drains, prevalence of epidemics, etc. , are again and 238 THE ESSENTIALS OF LOGIC again found to accompany an increase of the average death-rate. " 1 The principle involved is essentially that of concomitant variation.
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