500 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



of there being periods in these phenomena embracing twenty periods of 

 the lower order, and extending over two hundred and twenty-two years. 

 We will now endeavor in the same way as the changes in the weather, 

 the harvests, the migrations of the grasshoppers, &c, have been com- 

 pared with tlie solar spots periods, to compare these latter with our 

 Bohus Ian herring-fishery periods, and we shall find that there is such a 

 remarkable correspondence between the two that it can scarcely be con- 

 sidered accidental. Starting from the last of the above-mentioned fifty- 

 five and one-half years' periods, viz., the one extending between the 

 minima of solar spots, 1810-1867, we will give a series of fifty -five and 

 one -half years' periods, and with each of these we will mention brietly 

 whatever is known regarding the "genuine sea-herrings" periodical 

 occurrence on the coast of Bohuslan, and when we have no data what- 

 ever we will mention such occurrences as can possibly be supposed to 

 have some connection with the herrings' periodical occurrence ; for from 

 the time previous to the year 1300 we have scarcely any information re- 

 garding our Bohuslan herring fisheries. 

 18G7-1922. (Rich fisheries began in 1877.) 

 1811-1866. (Xo good fisheries.) 

 1755-1810. (Rich fisheries 1748-1S08, which, especially during the last 



quarter of the eighteenth century, assume enormous dimensions.) 

 1699-1754. (Xo specially good fisheries till near the end of the period 



from 1747 or 1748.) 

 1643-1098. (Good fisheries, at least between 16G0-10S0.) 

 1587-1642. (No good fisheries.) 



1531-1586. (Particularly good fisheries, at least between 1556 and 15S7.) 

 1475-1530. (No good fisheries.) 



1419-1474. (Good fisheries, at least about the middle of the century.) 

 1363-1418. (No good fisheries.) 



1307-1362. (Particularly good fisheries, at least during the first thirty 

 years of the century, which probably already commenced towards the 

 end of the preceding century.) 

 1251-1300. (At the beginning and about the middle of the period no 

 good herring fisheries, although probably the fisheries were good 

 towards the end.) 

 1195-1250. (Probably there were good fisheries, judging from the fact dur- 

 ing this period Gullholmen, Ockero, and other desert islands were colon- 

 ized, and the convents of Marstrand and Dragsmark were founded.) 

 1139-1194. 

 1083-1138. (Probably there were good fisheries, during which Konun- 



gahella became the most important commercial city of the north.) 

 1027-1082. 



971-1026. (Good fisheries, at least during the reign of Olaf the Saint.) 

 915-970. (Xo good fisheries, at least during the beginning of the reign 



of Gunhild's sons.) 

 859-914. 



