260 



Prof. Kupffer's Abstract of Meteorological 



When discharged of their acquired electricity, they remain 

 attached to the anti-electric plates, and thus assume the coun- 

 teracting character above mentioned, obstructing the current 

 in proportion to the quantity collected on the surface of the 

 plates (32). But when there is free acid, it no sooner comes 

 in contact with the zinc, than it begins to act upon it, and the 

 zinc, in the act of dissolution, gives out positive electricity to 

 the liquid ; i. e. in the direction of the current (40), thus 

 balancing, or more commonly overcoming, the neutralizing 

 influence of the negative liquid particles (42), whilst they act 

 with their full effect in exalting the copper : and hence the 

 superiority of acid charges (23). 



The reader will perceive that the theory of two fluids is 

 most conformable to these views. It has not been insisted 

 on, because not fully received in this country, nor quite free 

 from ambiguity in its application. 



XLII. Abstract of Meteorological Observations made at St. 

 Petersburg, in 1830, at the Astronomical Observatory. By 

 MM. Wisniewsky and Tarkhanof; and calculated by Pro- 

 fessor M. A. Kupffer*. 

 ¥ N the following observations the thermometer is divided ac- 

 •*■ cording to Reaumur, and the barometer into French inches. 

 The barometric heights have been reduced to the tempera- 

 ture of 14° of Reaumur, and the months are reckoned accord- 

 ing to the New Style. 



Table I. Containing the Mean of the Thermometric Observa- 

 tions for every Month of 1830. 





Months. 



January.. 

 February 



March 



April , 



May 



June 



July 



August 



September . 

 October.... 

 November . 

 December. . 



Means. _}- 2-6 



7 h a.m. 



o 



9-46 



8-54 



4-59 



0-83 



4*46 



11-59 



13H 



1316 



6-08 



3-17 



0-36 



4-76 



2 h P.M. 



- 8-03 

 6-55 



- 113 

 + 4-30 



7'76 

 14-67 

 1573 

 16-65 

 10-77 



5-68 

 + 0-72 



- 3-64 



9 h P.M. 



■f 



8-44 



724 



3-25 



1-18 



3-86 



10-89 



12-66 



12-65 



7-33 



3-86 



-|- 0-28 



- 411 



+ 4-74 + 2-47 



Means. 



o 



- 8-64 

 7-45 



- 2-99 

 ■+• 2-10 



5-36 



12-38 



13-83 



1415 



806 



4-24 



+ 0-21 



- 417 



+ 3-09 



According to the tables communicated by Dr. Brewsterf , we 



* Communicated by Professor Kupffer. 



f Edinb. Journal of Science, for June 1826. 



