1845.] 



Evaporation on the open Sea. 



215 





Latitude. 



Longitude. 



Barometer. 



Thermome- 



Evaporation 

 in 













inches. 





O / 



^~7~ 





o 





October 3 



37 15 S 



40 31E 



29.90 



62 



0.40 



4 



37 13 



44 05 



30.13 



63 



0.38 



5 



37 19 



47 50 



30.10 



64 



51 



6 



37 09 



5151 



30.06 



66 



0.33 



7 



36 38 



56 14 



30.08 



56 



0.40 



8 



35 58 



59 50 



30.12 



58 



0.45 



9 



35 39 



62 21 



30.16 



61 



0.40 



10 



34 46 



67 19 



30.14 



62 



0.40 



11 



33 24 



71 47 



30.02 



63 



0.41 



12 



31 51 



76 04 



29.94 



63 



0.35 



13 



30 27 



79 05 



30.09 



66 



0.38 



14 



28 54 



82 37 



30.16 



69.5 



0.37 



15 



26 14 



84 25 



30.18 



71 



0.39 



16 



24 25 



86 10 



30.19 



71.5 



0.60 



17 



23 02 



86 14 



30.24 



72 



0.62 



18 



21 06 



86 18 



30.10 



73 



0.72 



19 



J 8 25 



86 34 



30.11 



76 



0.68 



20 



16 39 



86 36 



30.10 



77.5 



0.70 



21 



14 42 



86 54 



30.11 



81 



0.70 



22 



11 07 



86 54 



30.00 



82 



0.78 



23 



7 39 



86 34 



30.09 



84 



0.80 



24 



3 57 



87 10 



30.05 



84.5 



0.82 



25 



2 08 



87 19 



30.04 



83.5 



0.75 



26 



1 09 N 



87 57 



29.97 



84 



0.86 



27 



4 19 



89 32 



30.00 



82.5 



0.98 



28 



641 



90 16 



30.00 



84 



1.00 



29 



7 58 



90 40 



30.00 



84.5 



1.06 



30 



8 50 



90 52 



30.02 



81.5 



0.88 



31 



9 35 



90 40 



30.00 



84 



0.72 



November 1 



10 55 



90 15 



30 00 



84 



0.93 



2 



13 10 



89 56 



30.03 



81 



0.82 



3 



14 15 



90 00 



30.05 



86 



0.40 



4 



15 20 



89 30 



30.05 



84 



0.70 



5 



17 25 



88 49 



30.00 



83 



0.67 



6 



18 34 



88 24 



30.00 



83 



0.72 



7 



18 52 



88 45 



30.02 



83 



0.68 



8 



19 23 



88 53 



30.10 



83 



0.88 



9 



19 18 



89 37 



30.00 



82 



1.15 



10 



19 56 



89 43 



30.00 



82 



1.25 



11 



20 37 



89 00 



30.00 



81 



1.24 



12 



20 54 



89 12 



29.95 



80 



1.32 



13 



Sandhe. 



ids. 



29.98 



80 



1.04 



The reader will perhaps be surprised at this high rate of evapora- 

 tion on the open sea, differing as it does so widely from that deduced 

 by M. Von Humboldt from his own observations with the hair hy- 

 grometer. That accomplished observer gives the following results, 

 calculated from a formula of M. d' Aubuisson, which does not how- 

 ever appear to meet all the circumstances of the case. 



A 



