405 



tension to 0. The very low tension in the freshwaters of Disko 

 is hereby explained (pp. 370 — 75). 



5. The waters of the «hot springs» of Disko become 

 mixed in their «funnel» with greatly varying quantities of sur- 

 face-water. The unmixed water contains no trace of free car- 

 bonic acid (pp. 375—78). 



6. Danish freshwaters are, as a rule, rich in carbonic 

 acid and dissolved carbonate of lime (pp. 379 — 80). 



7. The deposition of carbonate of lime in lakes is almost 

 exclusively due to ^evasion» of carbonic acid from the surface 

 of the lake to the atmosphere. The yearly deposition of lime 

 may be estimated from the average tension-difference between 

 the surface of the lake and the atmosphere. For the Fure-Sö a 

 tension-difference of 0.02 "/o will correspond to a yearly de- 

 position of about 6000 tons of lime (pp. 381 — 85). 



8. The dissolution of calcareous remains of organisms is 

 a simple function of the tension of carbonic acid in the sur- 

 rounding water (pp. 388 — 89). 



9. In the Baltic and certain other localities some species 

 of mussels seem to protect themselves by various means against 

 attack from waters with a high tension of carbonic acid (pp. 387 

 -389). 



10. The alkalinity of a sample of ocean-water is deter- 

 mined by a series of augmenting and diminishing factors, and 

 the same being the case with the total alkalinity of the ocean 

 this cannot be regarded as invariable (pp. 391—400). 



11. The C'Oo-tension of the ocean-surface often differs 

 from that of the atmosphere and may cause considerable ab- 

 sorption or elimination of the gas (pp. 401—403). 



