On iXif/hf. 9- Froste. 71 



0,oooô m^. 

 Assuming tlie specific weiglit of tlie moist harley-crop to be 0,s, \ve shall get a weiglit of 



0,4 kg. 



The emission power of the crop beiiig greater tliaii tliat of tlie glass \ve shall estimate 

 it twice of that of tlio former and shall tlien get 



per m^ ami per hour, or per 3 liours 



^'"^* . 6,485 = 2,2497 Cal. 



0,55t> 



6,75 Cal. 



As Ulis quantity of lieat is proportional tlic fall of température it will be easily nn- 

 (lerstood that the resuit would hâve bccn the same, if tlie température had fallen from 



O« to - 50,55 (- fi») 



and also that it would have grown proportionally to the fall of température, if the latter 

 had been still greater. 



For 10 hectares this will be 



675,000 Cal. 



corresponding to about 84,4 kg of coal. 



PAG. 52. NOTE VI. M:r Rindell's observations made at Mustiala, wlien a Richard's 

 registering thermometer was used, coincide completety with the above-montioned observations. 

 The curve denoting the mardi of température during the night showed a sliglit fall from 1 

 to 2 hours after sunset until near sunrisc next morning. 



PAG. 58. NOTE VII. A great many valuable observations have been made of late in 

 différent places (at the p]iffel-tower, at Tour St. Jacque, Paris, at Puy du Dôme, at Ben 

 Nevis etc.) with the object of observing the wind in the higher layers of air, and many a 

 peculiarity has been brought to light. Among others it bas been discovered that the upper 

 layers of air are not unfrequently in movement, wbile the lower are perfectly calm. Where 

 the boundary betwceu the calm layers of air and the nioveable ones is to be found bas, howe- 

 ver, not been determined, but the very fact gives us reason to suppose that this boundary is 

 not too highly situated, and if this is the case, there is even reason to believe that a dis- 

 turbing of the equilibrium may be brought about by large artificial currents of air. 



PAG. 52. NOTE VIII. We rcfer here to D:r Th. Homén's observations (Bidrag till 

 kännedom af Finlands natur och folk. Vol. 40, 1885) which in every way confirm the 

 results of the observations given here. 



