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engelske Fod eller 2o94 Meter. De Eøjdemaalinger, som 

 jeg tik fra Aakerpladsen i Mary MussBugten og fra Lodde- 

 stationen No. 224 paa Østsiden (Side 12) stemme meget vel 

 med en ETøjde af 1945 Meter, idet de give, Distantserne 

 tagne etter Kartet, respective L968 og 1944 Meter. 



Paa alle de ældre Karter tindes paa Vestsiden af 

 Beerenberg, ved Havet, mellein første og andet Korsnes, et 

 Sted betegnet som en Isbræ. Del hedder i "Zeespiegél" : 

 Heynste Ysbergh, bos Scoresby : Iceberg, og bos Vogt er 

 vist en fra Beerenbergs Side til Havet udgaaende stur Is- 

 bræ. Da vi besøgte Jan Mayen, tandtes lier paa denne 

 Kant ingen Isbræ. der gaar til Havet. Vi saa kun enkelte 

 Snéflækker paa den lavere Del af Øen. Scoresby og Vogt, 

 der begge kun saa Jan Mayens Østkyst, have aabenbart 

 hentet denne Bræ fra det gamle hollandske Kart. Er 

 Bræen forsvunden siden Begyndelsen af det 18de Aar- 

 hundrede? Zorgdrager har den. og den staar nævnt i Be- 

 skrivelsen i "Zeespiegél". Eller foreligger en Forvexling 

 med Bræerne paa Nordsiden? 



De 3 store Isbræer paa Nordsiden af Jan Mayen 

 tindes ikke angivne paa Kartet i "Zeespiegél", og heller 

 ikke hos Zorgdrager. Scoresby eller Vogt. Nordsiden er. 

 som tidligere nævnt. ikke beskrevet i "Zeespiegél", men 

 paa Zorgdragers Kart tindes angivet Trankogerier. i østre 

 Korsbugt. saa at man maa antage. at denne Kyst i tidligere 

 Tider var vel kjendt. Have disse Bræer forst siden Midten 

 af forrice Aarhundrede naaet den nuværende Udstrækning? 



. Paa Østsiden af Beerenberg saa vi fem store Isbræer, 

 der med en brat Heldning gik lige ned til Havet, Flere 

 end dette Antal kunde med Bestemthed ikke anføres. -Zee- 

 spiegél" har saavel i Kartet som i Beskrivelsen kun 3 Is- 

 bræer her, i Beliggenhed svarende til de tre nordligste, 

 ligesaa Zorgdragers og Scoresby's Kart. hvilket sidste dog 

 grupperer dem noget anderledes. idet de to sydligste ere 

 lagte paa miget nær samme Plads. som vore to sydligste. 

 Scoresby 's Billede derimod viser flere end 5 til Havet ried- 

 rækkende Bræer paa denne Kyst. hvilke det er vanskeligt 

 at identiticere med de af os sete.. Paa Kartet i Berna's 

 "Nordfahrt" kan jeg ikke gjenfinde vore fem Bræer, men 

 vel paa Billedet af Østkysten i samme Verk. Ere de stejle 

 Isbræer paa Østkysten med Hensyn til Antal og Betyden- 

 hed vexlende med Tiderne? 



Sydbræen tindes ikke paa Karterne i "Zeespiegél", 

 hos Zorgdrager og Scoresby. omtales heller ikke i disses 

 . Beskrivelser. Den forekommer først hos Vogt. • hvis Kart. 

 Billeder og Beskrivelse stemme godt med vore Iagttagelser. 

 Kysten udenfor er. etter de ældre Beskrivelser, meget uren. 

 saa at Bræen maaske ikke havde nogen hydrografisk Inter- 



the altilnile of Beerenberg - August the 3rd - to be 

 6380 feet, wbereas Scoresby's determination is 6870 feet. 

 The altitudes 1 succeeded in taking from our arichorage in 

 Mary Muss Bay and from Sounding-station 224. on the 

 •east side of the island (page 12), agree very well witb a 

 height of 6380 feet, corresponding as thej do to 6457 and 

 6377 feet. • 



< hi the west side of Beerenberg, in close proximity 

 to the sea. between the first and second Cross Capes, there, 

 is in all of the earlier maps a point marked to denote s 

 glacier. ln the "Zeespiegél" it bears the name of Heynste 

 Ysbergh; Scoresbj calls it Iceberg; and in the map accom- 

 panying Vogtfs work on JanMayen a large glacier is here 

 seen extending down the slope of the mountain to the sea. 

 When ire visited the island. there was no glacier reaching 

 out to file sea on this side. We merely saw a fe w patches 

 of snow scattered here and there over the lower tract 

 of the coast, Scoresby and Vogt, both of whom saw only 

 the eastem shores of Jan Mayen, have manifestly followed 

 the old Dutch map. Can the glacier have disappeared since 

 the beginning of the lStb. century? Zorgdrager has it. and 

 it is mentioned in the account given in the "Zeespiegél." 

 Or lias there lieen some mistake connected witb the glå- 

 mers of the north side? 



The 3 great glaciers on the. north coast of dan Mayen 

 are not to he found on the map in the "Zeespiegél." nor 

 on those by Zorgdrager. Scoresby. or Vogt, As previously 

 mentioned. no account is given of the north side in the 

 old Dutch work; but on Zorgdragers map we have given 

 the position of factories established in East Cross Bay 

 for boiling down blubber; and hence that coast must have 

 been well known in former times. Possihly. the glaciers 

 in question did not attain their present extent till the 

 middle of the last century. 



On the' east side of Beerenberg, we saw 5 large 

 glaciers shelving abruptly down to the sea. A greater 

 number could not be clearly distinguished. Only 3 glaciers 

 are to be found here on the map in the "Zeespiegél," 

 corresponding in position to the three northernmost of ours, 

 as also on the maps by Zorgdrager and Scoresby. though 

 the latter groups them somewbat differently, the two lying 

 tarthest south having almost the same position as the two 

 most southerly of those observed by ourselves; but on the 

 other hand. in Scoresby's view of the coast more than 5 

 glaciers. which can hardly be identified witb those we ob- 

 served. extend down to the sea. On the map in Berna's 

 -Xordfahrt" 1 cannot tind our 5 glaciers: in his view of 

 the east coast. however. in the same work. they are easy 

 to identify. Do the precipitous glaciers on the east coast. 

 as regards number and extent. possihly undergo some change 

 in the course of centuries? 



The Southern Glacier is not to be. found on any of 

 the earlier maps pi dan Mayen, nor is it mentioned in the 

 accounts of the island given in the "Zeespiegél" and hy 

 Zorgdrager and Scoresby. The first to call attention to 

 this glacier was Vogt. whose map. views. and general ac- 

 count of the island closely agree with our own observations. 



3* 



