348 



A STUDY OF CORRELATIONS AMONG TERRESTRIAF, TEMPERATURES. 



with the departure for 1871, 0.31, which, for onr present purpose we call ao, we form 



its square, and also its product by the following departures in the order of time to any 



extent to which we may suspect a correlation. In the present case we have considered 



it sufficient to form the products through terms of nine years. The nine consecutive 



products formed by multiplying 0.31 by t for the years 1871 to 1880 are written in 



the first line of the following table. 



Next we take the year 1872, form the square of its departure, and the products by 



the departure for the nine years following. These form the second line of the table. 



We repeat the process for 1873 and subsequent years to the end of the series and 



write the results in consecutive lines with each initial year of the series. Of course the 



number of years available will fall off by one for each line in which the initial year is 



greater than 1895. The series terminating with 1904, we have eight products for 1896, 



seven for 1887, etc. 



Table VII. 



Time Correlation Among Annual Temperatures. 



