CYCLES 135 



are too low to be accounted for by the synthetic curve. The 7-year 

 cycle was almost absent from 1880 to 1905. Yet on the whole there 

 is a good deal of similarity. The prolongation of the synthetic curve 

 shows a small depression near 1927 and deeper ones at 1942 and 1947. 

 The interval during the 1930 's has high ordinates with an unimportant 

 depression at 1933. It is possible that the 1947 depression may 

 resemble the one of 1847 and be rather extreme. During the 1950 's 

 the curve is again high. High crests occur at 1937 and 1953. It is not 

 expected that this is entirely right, but the details are given here in 

 order to assist ultimately in finding the true variations. 



10 



