/i'tfii\^\'ii<M<^ ( 357 ) 



Observations and Experiments made upon thtdUusilkiid^'Effildii 

 of Vinous Fermentation. By M. Cagniaud Latour.* ''^* 



That he may prove the high interest of the subject of which 

 he treats, M. Cagniard Latour recalls to the recollection of the 

 Academy, that, in the year 1800, the Physical and Mathematical 

 Class of the Institute proposed the following as the subject of 



tain climates the atmospheric temperatures would appear to increase with the 

 height, even in full day. I have verified this result whilst discussing, 

 with very different views, the observations of Captains Sabine and Foster, 

 made in the year 1823, with the intention of determining the elevation of 

 one of the mountains of Spitzbergen, which was much isolated and very 

 pointed. 



On the 17th of July, between 4h. 30' and 6h. p.ni. the mean temperature 

 of the air was — 



At the lower station, + 1°.6 Centigr, 



At the summit of the mountain 501 faths. high, -f F.9 ; 

 The weather was dull, with a gentle breeze. 



On the 18th of July, between 3h. 20' and 6h. p.m 



At the lower station, -f- 1'.9 



At the summit of the mountain, . . . -f- 1''.2 ; 

 There was a thick mist, and a moderate breeze. 



On the 20th of July, between midnight and 2 a.m. — 

 (Note. — It is here to be remembered that on the 20th of July the sun 

 never sets at Spitzbergen, and that at midnight it is pretty high above the 

 horizon. In the place where Captain Sabine observed it was about Il°.) 



At the lower station, + 2°.4 



At the top of the mountain, . . . . + 4°.4 ; 

 • The weather was most beautiful and serene. 



On the 21st of July, between lO^h. a.m., and half-past noon — 

 At the lower station, .....+ 4''.3 



At the top of the mountain + 3°.9 ; 



It rained at the lower station, and the mountain was enveloped in clouds. 



It will now be observed that the anomaly is not exhibited when the sky 

 is wholly overcast. On the contrary, it attains its maximum under a serene 

 sky. All this perfectly accords with the explanation we have given of the 

 phenomenon in our instructions for La Bonit€, and which are grounded upon 

 the laws of the i-adiation of heat ; which also leads to the supposition, that, in 

 our own climate, when the weather is good, the temperature of the atmo- 



• In a Report to UAcademie de$ Sciences. By MM. Tlii^nard, Becquerel^ 

 and Turpin ; July 1838. ♦ ja'*»*iq 9«lJ it-- 



