372 Andr. Lundager 



In continuation of the foregoing remarks regarding the dimate 

 and the phenology I shall now give some observations concerning 

 the insolation. These measurements were effected with a black- 

 bulb thermometer in vacuum and an ordinary swinging thermometer, 

 which were placed at a height of 2Ч2 metres on the southern gable 

 of the villa against a background of black roofing paper. The tem- 

 perature of the air is given according to the thermometer in the 

 thermometer-case. 



March 3, 1907. Sun's altitude at midday 6°17' 



Time 1 p. m. 1.15 p. m. 



Air —29.6 —29.4 



Black bulb — 4.6 — 9.0 



Blank bulb —21.0 —20.0 



March 10, 1907. Sun's altitude 9° 



Time 11.30 a.m. 12.30 p.m. 



Air —29.5 -28.8 



Black bulb 0.0 + 0.8 



Blank bulb —23.0 —20.2 



March 11, 1907. 



Time 11.30 a.m. 12 midday 12.35 p.m. 1 p.m. 1.30 p.m. 



Air —26.0 —25.8 —25.6 —26.5 —25.1 



Black bulb + 0.9 — 0.2 + 0.5 + 0.5 — 1.0 



Blank bulb — 16.7 — 18.8 - 16.9 — 14.9 — 17.8 



March 12, 1908. 



Time 11a.m. 12 midday 12.50 p.m. 



Air — 29.0 — 27.0 — 26.2 



Black bulb + 1.0 + 3.8 + 4.5 



Difference. 30.0 30.8 30.7 



March 13, 1907. 



Time 10 a.m. 10.30 a.m. 11a.m. 11.30 a.m. 12 midday 



Air — 19.6 — 18.6 — 18.5 — 17.7 — 19.5 



Black bulb + 5.4 + 8.0 + 10.0 + 10.8 — 5.2 



Blank bulb — 12.0 — 7.0 — 6.2 — 2.2 — 10.2 



During the last observation the sun was somewhat clouded. 



March 15, 1907. Sun's altitude 11° 



Time 10 a.m. 10.30 a.m. U.a.m. 11.30 a.m. 12 midday 12.30 p.m. 1p.m. 



Air —21.0 —20.9 —20.4 —19.0 —21.0 —20.5 —21.2 



Black bulb + 2.6 +1.4 + 4.5 + 9.5 + 9.2 + 8.6 + 8.0 



Blank bulb —11.8 —15.6 —10.0 — 4.9 0.0 — 0.3 — 1.8 



