492 PROFESSOR FORBES ON THE DIMINUTION OF TEMPERATURE WITH 



Table I. — continued. 



Date. 



8 A. M. 



1 



8 p. M. 



Bonally. 



Colinton. 



Bonally 

 corrected. 



Colinton 

 corrected. 



Diff. 



! 



Bonally. 



Colinton. 



Bonally 

 corrected. 



Colinton 

 corrected. 



Diff. 



Oct. 1831 

 ... 1832 

 ... 1833 

 ... 1834 

 ... 1835 



Nov. 1831 

 ... 1832 

 ... 1833 

 ... 1834 



Dec. 1831 

 ... 1832 

 ... 1833 

 ... 1834 



49.71 

 47.03 

 45.61 

 46.58 

 42.61 



53.10 



50.77 

 48.06 

 48.87 



44.77 



Mean 



49.36 

 46.68 

 46.26 

 45.23 

 42.16 



63.22 

 50.80 

 48.03 

 48.85 

 44.66 



3.86 1 

 4.12 

 2.77 

 3.62 j 

 2.50 



60.06 

 46.46 

 46.32 

 45.52 

 41.87 



62.13 

 49.16 

 47.45 

 48.87 

 44.45 



Mean 



49.71 

 46.10 

 44.97 

 46.17 

 41.52 



52.21 

 49.14 

 47.40 

 48.85 

 44.33 



2.60 

 3.04 

 2.43 

 3.68 

 2.81 



228.69 



45.74 



246.56 

 49.11 



16.87 

 3.37 



227.47 

 45.49 



241.93 

 48.38 



14.46 

 2.89 



36.73 

 38.20 

 38.17 

 40.30 



40.03 

 39.40 

 40.67 

 41.37 



Mean 



38.38 

 87.86 

 37.82 

 39.96 



39.73 

 39.09 

 40.39 

 41.13 



3.36 

 1.24 

 2.67 

 1.18 



37.73 

 38.67 

 38.63 

 40.23 



39.50 

 40.10 

 39.70 

 42.63 



Mean 



37.38 

 38.32 

 38,28 

 39.88 



39.19 

 39.80 

 39.40 

 42.33 



1.81 

 1.48 

 1.12 



2.46 



162.00 

 38.00 



160.34 

 40.08 



8.34 

 2.08 



163.86 

 38.46 



160.72 

 40.18. 



6.86 

 1.72 



39.23 

 36.19 

 35.87 

 39.36 



41.81 

 39.61 

 38.42 

 39.77 



Mean 



38.88 

 35.84 

 35.52 

 39.00 



41.57 

 39.30 

 38.09 

 39.47 



2.69 

 3.46 



2.57 

 0.47 



38.93 

 36.81 

 36.10 

 39.35 



41.81 

 39.93 

 38.53 

 41.36 



Mean 



38.68 

 36.46 

 35.75 

 39.00 



41.68 

 39.63 

 38.20 

 41.10 



3.00 

 3.17 

 2.46 

 2.10 



149.24 

 37.31 



158.43 

 39.61 



9.19 

 2.30 



149.79 

 37.46 



160.61 

 40.13 



J 0.72 

 2.68 



Table IL 

 General Synopsis. 



Month. 







8 A. M. 



8 p. M. 



Mean 

 Diff. 



Feet of 



Ascent for 



1° Fahr. 





Bonally. 



Colinton. 



Diff. 



Bonally. 



Colinton. 



Diff. 



January . . . 



34.38 



36.30 



1.92 



34.98 



87.26 



2.28 



2.10 



361 



February . 







35.59 



37.90 



2.31 



36.26 



88.66 



2.31 



2.31 



819 



March . 







36.56 



40.61 



4.06 



36.83 



40.00 



3.17 



3.61 



204 



April . . 







41.08 



45.69 



4.61 



40.41 



45.01 



4.60 



4.60 



169 



May . . 







47.46 



52.56 



6.09 



47.41 



51.69 



4.28 



4.69 



167 



June . . 







63.75 



57.68 



3.93 



53.26 



66.91 



3.66 



3.79 



194 



July . . 







56.01 



69.38 



3.37 



65.90 



58.96 



3.06 



3.22 



229 



August . 







65.20 



58.56 



3.36 



58.75 



57.88 



4.13 



3.74 



197 



Sejjtember 







50.18 



53.01 



2.83 



49.63 



62.94 



3.41 



8.12 



236 



October . 







46.74 



49.11 



3.37 



46.49 



48.38 



2.89 



3.13 



285 



November 







38.00 



40.08 



2.08 



38.46 



40.18 



1.72 



1.90 



387 



December 







37.31 



39.61 



2.30 



37.45 



40.13 



2.68 



2.49 



296 





531.26 



670.48 



39.22 



529.71 



667.90 



38.19 



38.70 





General Mean 



44.27 



47.64 



3.27 



44.14 



47.82 



3.18 



3.22 



229 



I have compared the results of this Table, which are projected in the upper- 

 most curve of Plate XX., with the results obtained on the far larger scale of a dif- 

 ference of level of 6836 English feet, between Geneva and the Convent of St Ber- 

 nard, as given by Kaemtz in the second volume of his Lehrhucli der Metem-ologie. 

 Considering the different circumstances of the two, these curves (which I have 

 purposely reduced to a similar range) approximate wonderfully. They both indi- 



