80 p. A. ØYEN. 



tuiy. We do not, however, know anything about the date and 

 duration of such an oscillation. 



The first historical statemeat, from which we may derive 

 any light for the present investigation, is recorded by Schønijs"G, 

 who, in a special paper, enumerated some periods of bad crops, 

 ScHøJsrmG, it is true, did not deal with glacier oscillation, but 

 the climatic connection found to exist between that phenomenoia 

 and karvest conditions is quite sufficient to justify a comparison 

 of the respective dates of periodical climate changes. 



Placing in a table the dates of the periods af different 

 diimatic phenomena, and comparing, not only the periods ,ol 

 bad crops in Norway with the dates of the commencement of 

 glacier advance as stated by Richter, but also the dates of 

 the periods of a rather cold and damp climate, as pointed out by 

 Brückner, we then obtain the following list : 



Cold — damp Commencement Years 



periods of glacier advance of bad crops in 



(Brückner) (Richter) Norway 



1591 _ 1600 1592 1600 - 1602 



1611 — 1635 1630 1632 — 1634 



1646 - 1665 1675 1685 — 1687 



1691 — 1715 1712 1695 — 1697 



1730 — 1750 1735 1740 — 1742 



The last-mentioned period of bad crops in Norway, 1740 

 — 1743, was afterwards called „grønaarene" (years when the 

 corn was cut while green). This period of a rather extreme con- 

 dition of chmate, of which the date differs somewhat in diffe- 

 rent parts of Norway, is also characterized by being the first 

 from which statements are recorded regarding glacier oscillation. 



In several papers and in documents taken fi^om public archi- 

 ves, we find statements of a somewhat considerable increase of 

 the glaciers in the Jostedal in the years 1742 and 1743, espe- 

 cially as regards the Glacier of Nigard. From the middle of 

 August, 1742, to the same period in 1743, the Glacier of Nigard 



