318 Miss N. Thomas and Dr. A. Ferguson on 



Table II. 





Barometer 



(Mean) 



Temperatures in ° 0. 



Eel. 

 Hum. 



d 



Jc. 



n. 









(cm.). 









in inches. 



Max. 



Min. 



Mean. 



o 



(Mean). 

 Per cent. 













o 



o 









A 1 ... 



3019 



15-1 



14-7 14-91 



56 



00 



0-0307 



1-43 



A 2 .. 



30 14 



15-7 



150 14-35 



73 



0-3 



00126 



1-60 



A 3 ... 



3020 







19-55 



73 



0-5 



00187 



1-49 



A 4 ... 



3078 







| 19*85. 



71 



0-5 



0-0168 



1-50 



A, ... 



30-98 



22-5 



18*7 



i 20-60 



69 



0-5 



0-0158 



1-46 



A 6 ... 



29-94 



16-1 



15-3 



15-70 



74 



0-5 



0-0109 



162 



A 7 ... 



2960 



18-8 



17-7 



18-25 



70 



0-7 



0-0101 



1-69 



A 8 ... 



29-77 



18-4 



17-8 



18-10 



73 



10 



00079 



1-78 



A p ... 



29-60 



18-8 



177 



1825 



70 



1-2 



0063 



1-86 



A 10 ... 



2949 



18-8 



18-1 



18-45 



76 



1-5 



0-0053 



1-82 



A u ... 



30-13 



15-7 



15-0 



15-35 



73 



1-5 



0-0048 



1-88 



A 12 ... 



29-95 



18-7 



17-4 



18-05 



67 



20 



0-0053 



1-99 



A 13 ... 



29-69 



198 



18-7 



19-25 



72 



2-5 



00050 



1-99 



A 14 ..., 



29-57 



20-3 



19-2 



19-75 



71 



2-5 



0-0056 



1-97 



A 15 ... 



2983 



190 



18-5 



18-75 



71 



30 



00049 



1-97 



B x ... 



30-24 



21-7 



177 



19-70 



62 



05 



0-0291 



1-58 



B 2 ... 



30-23 



21-7 



18-1 



19-90 



60 



0-6 



00268 



1-57 



B 3 ... 



30-21 



21-3 



18-3 



19-80 



66 



0-7 



00206 



1-65 



bI ... 



29-55 



16-8 



14-7 



15-76 



90 



2-5 



00031 



200 



B 5 ... 



29-61 



17-1 



13-9 



15-50 



84 



2-5 



0-0047 



1-98 



G x ... 



30-21 



21-8 



18-9 



20-35 



68 



05 



0607 



1-67 



C, ... 



29 95 



15-7 



14-7 



15-21 



78 



2-7 



00379 



1-77 



ci ... 





2-4 



1-4 



1-9 





3-0 



0-0097 



206 



The table brings oat clearly several points of interest. 

 First, it is to be noticed that under no circumstances does 

 the value of n fall so low as unity, which Stefan's theory 

 demands. For vessels brimful of water, in which no " rim- 

 influence" is therefore apparent, the value of n is approxi- 

 mately 1*5 — about halfway between the value given by 

 Stefan's theory and the value which holds if it be assumed 

 that evaporation is proportional to area. As the depth of 

 the liquid below the rim increases, the value of n also 

 increases, rapidly at first and then more slowly, until when 

 the liquid has reached a depth of about three centimetres 

 below the rim, n has become practically constant and equal 

 to 2, so that the evaporation is now proportional to the area. 



A reverse series of changes takes place in the value of K. 

 Large when the vessel is brimful, the values become smaller 

 as d increases, finally, at a depth of about three centi- 

 metres, reaching a limiting value, which is a function of the 

 external variables — temperature, pressure, humidity, and 

 wind-velocity. 



