372 Andk. I^i;ni)A(;i:» 



In c'oiilimialion ol the foregoing remarks regarding the climate 

 and tlie phenology I sh;ill now give some observations concerning 

 the insolation. These measiirenieiils were elTected with a black- 

 bulb thermometer in vacuum and an ordinary swinging thermometer, 

 which were placed at a height of 2'/3 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 B'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 -f 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 -f 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 -f 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 IV 



Time 10 a.m. 10.30 a. m. 11. a. m. 11.30 a. m. 12 midday 12.30 p. m. 1 p. 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 -f 9.2 + 8.6 + 8.0 



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



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