60 H. MOHN. METEOROLOGY. [2nd. ARC. EXP. fram 



filled with spirits of wine, and the thermometers compared with the 

 standards at low temperatures. I have been told that such comparisons 

 were made several times, but the note-book containing them has not 

 come into my hands, though I have made repeated inquiries for it. 



None of the mercury thermometers divided into fifths of a degree 

 came back; so they could not be examined anew. But there is no 

 reason why they should have altered their corrections during the ab- 

 sence of the Expedition. During the years 1898 to 1902, thermometers 

 of exactly the same kind as those belonging to the Expedition have 

 remained unaltered at the Meteorological Institute. 



For the thermometers No. 9 and No. 22, I have taken the correc- 

 tions throughout to be nothing. 



For No. 10 I have taken the following corrections : 



from 0° to — 10° Corr. 0?0 

 „ -10 „ -30 „ -0.1 

 „ -30 „ -35 „ -0.2 



The mercury thermometers were observed when the temperature of 

 the air was above — 35° C. 



For the lower temperatures the following thermometers were ob- 

 served: 



4) Toluol Kuchler No. 17 and 



5) Toluol Kuchler No. 27. 



These thermometers were sling thermometers, divided into whole 

 degrees Centigrade. 



Fortunately these thermometers came back, and could be verified 

 in Kristiania afterwards. The corrections found were 



No. 17 1898 1903 

 at 0° -0!l 0?0 

 „ —20 0.0 



No. 27 1898 1903 

 at 0° 0?0 — 0!3 

 „ - 20 - 0.15 



I have taken for No. 17 Corr. = 0.°0 



and for No. 27 1898-1899 Corr. — 0°3 



1899-1900 „ —0.3 



1900-1901 „ - 0.4 



1901—1902 „ - 0.5 



at temperatures 

 below — 35°. 



The thermometers were suspended in a doubly louvred screen, which 

 also contained the minimum and maximum thermometers and a ther- 

 mograph Richard. From the 19'^ to the 27^^ of September, 1898, the 



