MACKEREL AND SUNSHINE. 



401 



I have to thank Mr. G. E, Bullen for assistance in plotting the 

 early curves which rendered the relation between sunshine and 

 mackerel probable, though I am myself entirely responsible for the 

 accuracy of the curves and figures as given in this paper. Mr. D. J. 

 Matthews has also helped me in various ways. 



My thanks are especially due to Messrs. Peacock & Co., of Lowestoft, 

 for the very great trouble they have taken in supplying the figures 

 showing the numbers of mackerel caught by their vessels and for 

 allowing them to be used. Without their ready co-operation this 

 paper could not have been written. 



iV 



10' 



1903 



1904 



1905 



1906 



1907 



1905 



Fig. 5. — Curves showing the means of the temperatures, in degrees Centigrade, recorded 

 at Stations E.5 and E.6 at the surface (continuous line) and at 10 meters 

 (dotted line), on the International Investigation Cruises in the month of May, 

 for the years 1903-1908. 



