Meddelelser om Grønland . *) GiESECKE (Mineralogische Reise in Grönland, Copenhagen 1878, p. 25)mentions an Unartoli in Southern Greenland with a temperature of 40°.During his stay it began to rain, and in a quarter of an hour thetemperature fell to 30°. The temperature of the hot springs in Green-land alwavs seems to be lowered bv rain-fall. 377 In this funnel ordinary surface-water, flowing along theice, must necessarily be collected and partly mixed with thehot water of the spring, and this accounts for the variabilityof the temperature, because the available quantity of surface-water is de
Meddelelser om Grønland . *) GiESECKE (Mineralogische Reise in Grönland, Copenhagen 1878, p. 25)mentions an Unartoli in Southern Greenland with a temperature of 40°.During his stay it began to rain, and in a quarter of an hour thetemperature fell to 30°. The temperature of the hot springs in Green-land alwavs seems to be lowered bv rain-fall. 377 In this funnel ordinary surface-water, flowing along theice, must necessarily be collected and partly mixed with thehot water of the spring, and this accounts for the variabilityof the temperature, because the available quantity of surface-water is dependent on the state of the weather and will beaugmented by rain in a short time. It is very improbable thatthe water of the spring itself should contain dissolved oxygen,as this gas is so easily combined with many minerals, but thesurface-water is of course saturated with oxygen at the pressurepresent in the atmosphere. If gas-bubbles are formed ^) andequilibrium obtained the oxygen-tension of such bubbles must Spring. Rock Fie. 9. correspond to a mixture of oxygen-free water with commonsurface-water. This is exactly the result of the analyses. At the depth where the bubbles are formed the tension ofcarbonic acid is evidently 0 but at the mouth of the springit is about 2. This fact is not surprising, for at the mouththe water is mixed with more surface-water and with thatportion of the surface-water which has just obtained a high ) The formation of gas-bubbles indicates in itself that a mixture of hotwater with cold may have taken place, because such mixtures, providedthat each water was saturated beforehand with a gas (for instance nitrogen ),will always be supersaturated and therefore liable to the formation ofgas-bubbles. 378 tension of carbonic acid by passing between the roots of theabundant vegetation, surrounding the «Unartok». It may be safely deduced from the determinations that thewater from the depth does not contain any trace of free car-bonic acid, and 1 ven
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