KATIO OF EVAPORATION TO HUMIDITY. 



333 



In the 4th series the thermometer was constantly at 10° 

 £54-5° F.] ; and the barometer at the beginning was at 

 28 in. 2-9 I. [30-1 in.]. 



The results of these experiments are given iri the follow- The table ex- 

 ing table, divided into four columns. The first of these pai * 

 contains the date; the second, the distance below the level 

 at the commencement; the third, the distance fallen be- 

 tween the times of measuring. These differences form ap- 

 parently a decreasing geometrical progression, as I quickly 

 perceived : but to render this law more evident I have added 

 a fourth column, in which the differences are calculated by 

 inserting five mean geometrical proportionals between the 

 first and last difference fouud by experiment. 



Tabulated Results. 



Date of the 



Fall of the 



Actu- 



Differ- 



Date of the 



Fall of the 



Actu- 



Differ- 



measures. 



water. 



al dif- 



ences 



measures. 



water. 



al dif- 



ences 



1807. 





fer- 



calcu- 



1307. 





fer- 



calcu- 







ences. 



lated. 







ences. 



lated. 



First Series. 



Third Series. 





Aug. 1 



Parts 







Sept. 18 



Parts 







A 



59 



59 



59 



21 



35 



35 



35 



7 



96 



• 37 



35-9 



24 



55 



20 



21-7 



10 



117 



21 



21-9 



27 



70 



15 



13-5 



13 



132 



15 



13-3 



30 



78 



8 



8-4 



16 



140 



8 



81 



Oct. 3 



82 



4 



52 



19 



145 



5 



4 9 



6 



86 



4 



3-2 



22 



148 



3 



3 



9 



88 



2 



2 



Second Series. 



Fourth Series. 



Aug. 24 



Parts 







Oct. 12 



Parts 







27 



47 



47 



47 



15 



24 



24 



24 



30 



73 



26 



27-8 



18 



37 



13 



141 



Sept. 2 



91 



18 



16-4 



21 



44 



7 



8-3 



5 



102 



11 



9-7 



24 



50 



6 



4-9 



8 



108 



6 



57 



27 



53 



3 



2-9 



11 



111 



3 



3-4 



30 



54 



1 



1-7 



14 



113 



2 



2 



Nov. 2 



55 



1 



1 



As 



