36 Selim Lemström. 



thermonieter has risen to — 2'',o, and reniains at this point. The resemblance 

 between Curve lo and Curve IIo is stiiking. 



As to tlie rest of tlie curves, ail tlie T,, i. e. tlie upper tlienuometers, 

 show a great similarity, except the rising at point h and c, at l,2o p. m. 

 being much more rapid. These points were situated at the upper side of the 

 field, by which fact this rapid rising is easily explained. The lower thermo- 

 meters, on the other hand, show a great dissimilarity. Curves II„ and 11^ for 

 the thermometers at points a and c near the ground are much alike. The ris- 

 ing at a begins about midnight, 12, lo p. m., but at c already at 11, 20 p. m. 

 The rising continues in a until l,2o p. m. and in c until 12, 12 p. m. In a 

 the falling is very rapid and is at 2 a. m. 0°,5, after which follows a rising 

 almost equally rapid. In c the falling is considerably sloAver and the lowest 

 point 2°,2 is reached at l,2o a. m., after which time the rising, being more 

 rapid in the beginning until 2 a. m. and afterwards slower, continues until 

 the end of the experiment. In neither of the places had the température gone 

 down to 0°. 



The two curves T„ in 11^ and II,,, Plan III, resemble each other in an 

 unmistakable manner. The corresponding thermometers were placed close to 

 the ears of lye, and consequently indicate the température of their surroun- 

 dings. The température falls with increasing rapidity until l,2o a. m., when it 

 shows, in h, — U'',3 and in a, — ü",8, and then it begins to rise in about the 

 same proportion, reaching 0" in point h, already before 2 a. m., and in d 

 about 2,40 a. m. 



From this is clearly seen that the sinking of the cold air about the ears 

 of corn is not so rapid as its cooling process, and consequently, a cooled layer 

 of air is formed round the ears, which layer partly remains there. It is, how- 

 evei', evident that the température of this layer does not fall so much as it 

 does near the ground outside the ryefield, because the layer of air underneath 

 is constantly changed and must, therefore, in some measure, raise the tempéra- 

 ture round the ears. 



The torches being lighted at 10, 30 p. m., they may be expected to 

 work from 11 p. m., and, therefore, we give the average value of the indica- 

 tions of the lower thermometers from this hour until the end of the experiment. 



In points a and c, the average of the lowei' thermometers is, fi'oni 11 

 p. m. to 3 a. m.: 



+ 2°,7 



and the average of those outside the ryefield (t\ TJ and (li): 



