NO. 10 SOLAR RADIATION AND WEATHER STUDIES ABBOT 



65 



9 II 13 15 17 19 21 23 2 4 6 



CYCLE YEAR FOR COD BASED ON 1812 



Fig. 27. — Catch of mackerel and cod in the North Atlantic, 23-year 

 cycles from 1812 to 1931. Curve for cod shifted in phase 2 years. Dotted 

 curves and dashed curves are means of cycles I, III, V and II, IV 

 respectively. Full curves are general means of all five cycles. 



