Hot and Thermal Springs. 269 



water in the bottle to be 36o.51. However, no weight can be 

 attached to this observation, as within twenty-four hours the 

 disturbances caused in the temperature by digging the hole, 

 could not yet have subsided. On the 22d September the bro- 

 ther of Mr Ziegler of Grindelwald observed a temperature of 

 87°.62. More reliance may be placed on this observation, 

 which was made twenty-three days after the burying of the bottle. 

 As we find by interpolation, that the temperature of the soil on 

 the 22d September was, on the Lbwenburg, 6°.79, and at Bonn 

 7°.l 9j higher than themean,themeantemperatureonthei^aw//iom 

 must be between -f-t}0o.84and -|-30°.45,supposingitstemperature 

 to follow the same progression as at those two places.* But 

 these values depend on suppositions which are still to be proved. 

 I, therefore, request all natural philosophers and other travel- 

 lers accustomed to such observations, who may happen to visit 

 the Faulhorn, so celebrated for the grandeur of its scenery, to 

 devote a few minutes to a similar observation, and to have the 

 goodness to communicate to me the result. For this purpose 

 I have committed a thermometer to the care of the innkeeper 

 on the Faulhorn, Hans Bohren, of which the observer may 

 make use. The landlord will have the kindness to direct the 

 observers to the spot where the box is buried, and will draw 

 out the bottle. Those who ascend the Faulhorn and Grindel- 

 wald, as is usually done, may make further inquiries of the pas- 

 tor, Mr Ziegler, who, as I have before said, is making similar 

 observations in his neighbourhood. Of course it is not to be 

 hoped that observations will be made in every month of the 

 year, as the innkeeper himself quits the Faulhorn at the end of 

 October, and does not return there till May, and as, in general, 

 during the winter months, it is almost if not quite impossible 

 to ascend this mountain. But even if we only obtain observa- 

 tions in the summer months, we may still hope to succeed in 

 deducing from them the probable scale of the yearly variations 

 of temperature, and from this to obtain the yearly mean ten)- 



• It is, however, probable that the maximum on the Fardhorn happens 

 later than at those two places, which are situated so much lower, and, in this 

 case, the mean temperature would there fall still further below 32°. The 

 calculations which follow below, and that which we learn from Heer (Frobel 

 und Heer loco citato, p. 322) on the duration of the warm season in the vari- 

 ous regions of the Alps, speak in favour of this conjecture. 



VOL. XXIV. NO. XLVIII. APRIL 1838. T 



