432 



taken a year later and about 60 miles to the south of Disko 

 had a tension of about 0.02 % only (see 'preceding paper 

 p. 403, No. 1). 



2. The state of the mussel-shells in a number of localities 

 along the East-Greenland coast furnishes strong evidence that 

 the surrounding water possesses a high tension of carbonic 

 acid (see the preceding paper pp. 388 — 89), but if this water 

 can possibly reach Baffin Bay and rise to the surface there, 

 or if, perhaps, analogous waters may come down directly from 

 the North, are not questions for me to decide. 



With regard to the analyses of Moss there remains one 

 very serious difficulty. How can the sea give off carbonic acid 

 when it is covered for hundreds of miles in all directions with 

 a solid sheet of ice, as it certainly must be on all sides of an 

 observer in Grinnel-Land during the months of December, 

 January and February? 



I do not know, and I must leave this Arctic riddle of the 

 carbonic acid unanswered, trusting that in these days of intense 

 investigation of the extremities of our globe it will ere long 

 be approached by others, and the solution some day brought 

 to light. 



