366 W.P. Blake on Evaporation on the Tulare Lakes. 
The experiment was conducted in the following manner. A 
large sheet-iron pan, such as is used by the miners for ‘ prospect- 
jing,” and which corresponds very nearly in size and shape with 
an ordiuary milk-pan, was placed upon a firm staud about two 
eet above the surface of the ground. This pan was nearly 
filled with water aud a thermometer and small ivory scale were 
immersed in it. The whole was in a situation favorably exposed 
to the action of the winds, and was protected from the direct 
rays of the sun by a shed, covered with brush and leaves. The 
shade preventing the sun from unduly heating the water by act- 
ing on the bottom and sides of the pan. The amount of evapo- 
ration was noted from time to time by the height of the water 
on the scale. The results are given in the annexed table. 
Table showing daily evaporation at Posé Creek, Cal. 
Ther. | Ther. | Quantity | Daily 
P 
air, (water. jevapor’t’d. evap'n. Remarke—winds; &e. 
Date. Time. 
1353. 
Aug. 26) sunrise | 65°} 62° 
12 
M. 
2p.m.|100°| 80°) + 94 
‘6 0 \ Wind NW and steady from 
; path cats a vis 2 11 a. ™. till sunset. 
27) sunrise | 60°} 58° 
9 a.m.} 85°; 70°} y. Wind rising and from the SW. 
12m. | 96°| 78° : 
2 p.m. {100°} 82°) Wind strong and from NW. 
4 “ {100°} 80° 
30 | 96°) 78°) ts | ae 
5: 
* 28) 6 a.m. | 60°} 56° 
12:30 | 95°| 78°; Wind strong since 11 a. M. 
as | ts |Wind ceased at 6. 
12:30pm) 86°) 74°) 5 Wind rising at 9 A. M. 
i 4P.M. | 90° yin as q's 
aaa eee 
From this table it will be seen that the observations were con- 
was covered with a thin film or pellicle, probably of light dust, 
shia must ha great pro 7 pot 
air, 
