20 MR JOHN AITKEN ON DEW. 



October 7, 1885. 5.30 p.m. 



Grass. Soil. 



Temperature of soil, 3 inches below surface, 47°*5 46° 



12 „ h 47°*5 44° 



At 6.30 p.m. 



Grass exposed, lost 5£ grains, or 0*356 grammes. 



M under tray, » 3 h , 194 m 



Bare soil exposed, n 5£ n 0*356 n 



n under tray, n 2f n 0178 m 



At 10.30 p.m. 



Grass. Soil. 



Temperature on surface, 36°*5 40° 



ii of soil, 3 inches below surface, 44° - 5 42°*1 



12 „ „ 47° 44° 



Grass exposed, lost 24 grains, or 1-555 grammes. 



ii under tray, m 6 n 0*388 n 



Soil exposed, .. 23 „ 1-490 



ii under tray, n 8 n 0*518 n 



October 12, 1885. 5.30 p.m. 



Grass. 



Soil. 



44° 



45° 



44°-5 



43-5 



Grass. 



Soil. 



31°*5 



35°*5 



42° 



40°*2 



44° 



43°*5 



Temperature of soil, 3 inches below surface, 

 ii n 12 n ii 



At 10.15 p.m. 



Temperature on surface, 



,, of soil, 3 inches below surface, 42 



ii ii ■ 12 ii ii 



Grass exposed, lost 30 grains, or 1*944 grammes. 



n under tray n 6 n 0*388 



Soil exposed, ,. 22 „ 1*425 



n under tray, n 6£ n 0*421 



There was a little wind on this occasion, and very little dew formed. 

 During the night the min. on the grass was 28°*5, under it 41°; and it was not 

 till 10 o'clock next morning that the thermometer on the grass was as high as 

 the one under it. 



The following reading were taken about the 20th October, the exact 

 date unfortunately is omitted in note-book : — 



5.15 p.m. 

 Temperature of air — Dry bulb, 42*5 ; Wet bulb, 40. 



Grass. Soil. 



Temperature on surface, 39° 42° 



.1 of soil, 3 inches below surface, 46° 48° 



13 i, „ 46°*3 46°-l 



