Hot and Thermal Springs, §-c. 261 



In order from these to calculate the decrease of temperature 

 ■with the height, it was necessary to assume a fixed temperature 

 at a certain height ; a supposition which, indeed, strictly speak- 

 ing, does not actually exist. We might have taken for our 

 fixed point, either the temperature at the level of the sea, or on 

 the limits of perennial snow. To take the former as a terminus 

 a quo did not seem convenient, as the mean temperature of the 

 places on the level of the sea varies between 78°.8 and SS'SO, 

 •which difference would give a difference in the decrease of tem- 

 perature, from the surface of the sea to the limits of perennial 

 snow, of 71 feet in 2°.25. I, therefore, took S4°.92, given by 

 JBoussingault as the mean temperature on the limits of perpe- 

 tual snow (14474 feet above the sea), as a constant value, and 

 from it and the mean temperatures of the places below it, I cal- 

 culated the difference of height corresponding to 2°.^5 differ- 

 ence of temperature. This gave the 3d column of numbers 

 contained in the follomng table. The heights given by Bous- 

 singault in metres are reduced to Paris feet, and the centesi- 

 mal degrees to those of Fahrenheit. 



Names op Placks. 



Cumana, 

 La Guayra, 

 Rio Hacha, 

 Santa Marta, 

 Baranquilla, 

 Carthagena, 

 Panama, 

 Tumaco, 

 Guayaquil, 

 Payta, 

 Esmeraldas, 

 Barranca Nuevo, 

 San Carlos, 

 Novita, Choco, 

 Honda, 

 , Giramena, 

 Tomependa, 





 

 

 

 

 

 

 



e 















520 



554 



640 



6(J5 



1,200 



.5f<Ng 



i- o a* 





Names of Piacks. 



Cay ma, 



Estanque, 



San Martin, 



Maracay, 



Haeuita, Choco, 



Valencia, 



Neiva, 



Barquisimeto, 



Mariquita, 



La Vittoria, 



Alto de Mombii. 



Antioquia, 



Tocuyo, 



Truxillo, 



Tanipo de la Or- 



queta, 

 San Geronimo, 



1,210 

 1,311 

 1,330 

 1,351 

 1,431 

 1,502 

 1,597 

 1,607 

 1,687 

 1,727 

 1,794 

 1,936 

 1,930 

 2,202 



2,262 



2,318 



81.72 

 80.15 

 79.92 



77-9 



79.02 



78.8 



77.0 



78.12 



77-67 



78.12 



77.0 



77.22 



75.87 



77.0 



770 



74.97 



650 

 668 

 672 

 702 

 680 

 680 

 704 

 686 

 687 

 680 

 693 

 677 

 704 

 668 



668 



696 



