00MTBNT6. HI 



Chap. III. Can the heat of Thermal Springs be 



the result of chemical processes or of local circum- 

 stances ? and can local circumstances cause any mo- 

 difications in the temperature of Thermal Springs ? 343 



Chap. IV. Can Springs convey Heat from the In- 

 terior of the Earth to the Surface ? . 365 



Chap. V. — The Temperature of Springs being a 

 function of that of the Meteoric Waters, and of the 

 Strata of the Earth through which they flow, it is 

 required to determine whether the Variations of 

 the Temperature of the Meteoric Waters also shew 

 themselves in Thermal Springs, . . 359 



• Chap. VI. i— Can the Mean Temperature of a place 

 be determined from the Temperature of Springs ? 

 and is the Mean Temperature of the Soil the same 

 as that of the Air? . . . 362 



XIV. Analysis of a Memoir on the Structure and on the 

 Origin of Mount Etna. By M. L. Elie de Beau- 

 mount, Member of the Royal Academy of Sciences 

 of the Institute. Communicated by the Author, 



XV. Questions for Solution relating to Meteorology, Hy- 

 drography, and the Art of Navigation. By M. 

 Arago, ..... 393 



1. Meteorological Phenomena, . . . 394 



2. Observations designed to characterize the presentstate 



of the Globe in regard to Temperature, . 395 



3. Of the Calorific Action of the Solar Rays viewed in 



their relation to the situation of places on the Globe, 396 



4. Experiments to be made on the Radiation of the Sky, 397 



5. Examination of an Anomaly which Atmospheric Tem- 



peratures, taken at different elevations, present in 



the night, when the sky is calm and clear, . 399 



6. Expeditious Method of determining Mean Tempera- 



tures in Equinoctial Countries, . . 400 



7. Observations to be made nn Thermal Springs, . 401 



XVI. Abstract of an Address delivered on presenting the 

 Keith Medal, adjudged by the Council of the Royal 

 Society of Edinburgh to Professor Forbes, for his 

 Experiments on the Polarization of Heat ; by Dr 

 Hope, Vice-President of the Society, . 405 



