1910] WIEGAND—TRANSPIRATION 435 
SERIES IIA.—Same coverings as in the last; experiment conducted in sunlight, 
on a black table top. 
Newer blotters.) 3.900 4-2 000) cxxsa 6.820 ):1 00g... 
CORON. 5;': 2.590 | 0.700 | 0.300 | 3.320 | 0.486 | 0.514 | 1.71 1.4 
Thick cotton. . TlATO [°OVZ0E | O.619)| 2.31407) 6.3007 (.0.00F | F217 | 0:0 
a ree 1/220 1.01326 1-0: 07% |. 35280 | 0:106°], 0.502.) F.10 
s III. Se piexe) (a) one layer of outing flannel (cotton), (b) one layer 
thin silting flannel, (c) wi 
Naked blotter. . 4 0: 442 | ft o0e Tr... 4.896 12.006 T .> 3 
Outing flannel ..| 0.301 | 0.877 | 0.123 | 1.540 | 0.398 | 0.602 | 4 
Ordinary “a 0.300 | 0.874 | 0.126 | 1.880 | 0.486 | 0.514 | 4.08 2.80 
ee 0.157 | 0.457 | 0.543 | 0.810 | 0.209 | 0.791 | I ae 
SERIES IV.—Coverings: (a) one layer mosquito netting, (b) wax. 
Naked blotter...| o. we) $.000 10 ce. 3-44 Foe te ee oo 
Mosquito netting} 0.337 | 0.991 | 0.009 | 2.85 | 0.828 | 0.172 | 19.11 12.7 
i eee 0.160 | 0.470 | 0.530 | 0.69 | 0.200] 0.800] 1.51] .... 
SERIES V.—Coverings: (a) human hair soaked in gasoline and paraffin, cut ie 
into 1-3mm lag and sprinkled sparingly over a blotter, to simulate a strigos 
covering, (b) wa: 
Naked blotter. . .| 0.3444] 1.000 | ..... 3,40: + £5000 | ees SO Pee 
Strigose hair ....| 0. 0. 3399 0.987 | 0.013 | 3.38 | 0.944 | 0.056] 4.30] 2.9 
MR Se fos -1580] 0.459°| 0.541 | 0.73. | 0.204 | 0.796} 1.47] .-- 
From the above five series of readings the following may be 
deduced: 
1. Evaporation from an uncovered surface was about 10.6 or 
10.8 times as great in the wind of the fan as in still air (series I and IT, 
columns x and 4). 
2. In sunshine, under the conditions of the experiment, it was only 
1.8 times as great in wind as in still air (series ITA, columns 1 and 4). 
3. In still air it was 9.3 to 12.2 times as great in the sunshine 
as in the shade (series I, II, and ITA, column 1). 
4. In the wind it was only 1.6 to 2 times as great in sunshine as 
in shade (series I, II, and ITA, column 4). 
5. Hairy coverings of all kinds and thicknesses used were less 
efficient in retarding evaporation than the layer of wax employed 
(columns 3 and 6 in all series). 
