WISLIZENUS — ATMOSPHERIC ELECTRICITY. 115 



Additional Remarks on Atmospheric Electricity. 

 By A. Wislizenus, M.D. 



The delay in the publication of this volume enables me to 

 add to my observations of atmospheric electricity in 1861, 

 the result of my observations in 1862. The latter observa- 

 tions have been made in the same manner and by means of 

 the same tine glass thread, which, after many thousand tor- 

 sions, proves as good as ever. I present herewith in tabular 

 form the general result of my observations in 1861 and 1862. 



I. Monthly mean of Positive Atmospheric Electricity in 1861 and 

 1862, at St. Louis, Mo., based upon daily observations at 6, 9, 12, 

 3, 6 and 9 o'clock, from morning till night. 



Jan. Feb. Mar. Ap'l. May. 



1861*16. 5 12.1 9.8 8.8 7.8 

 1862.. .12.1 16.0 9.4 10.6 7.5 



* This table of 1861 differs in some decimals from that published on page 66 and in Dia- 

 gram No. 1. Haying discovered some errors, I calculated all my observations once more, 

 and give now the present as the corrected table. 



II. Monthly mean of Temperature and of Relative Humidity in 

 1861 and 1862, at St. Louis, Mo., based upon daily observations, 

 cotemporaneous with those of Atmospheric Electricity. 



TEMPERATURE. 



Mean of 

 Jan. Feb. Mar. Ap'l. May. Jun. Jul. Aug. Sept. Oct. Nov. Dec. Year. 



1861. ..32.2 40.4 44.8 58.1 64.1 76.9 77.5 78.6 69.1 57.9 46.0 39.7 57.1°f. 

 1862.. .28.9 30.2 43.2 55.0 69.7 75.1 81.2 80.7 72.1 57.3 42.6 41.3 56.4°f. 



RELATIVE HUMIDITY. 



Mean of 

 Jan. Feb. Mar. Ap'l. May. Jun. Jul. Aug. Sept. Oct. Nov. Dec. Year. 



1861. ..72.2 63.3 64.5 61.5 66.3 70.8 66.3 69.6 77.3 76.6 69.0 74.3 69.5 

 1862.. .85.3 73.9 70.8 67.0 57.3 67.0 66.8 64.3 74.2 67.2 69.5 74.6 69.8 



III. Yearly mean of Positive Electricity of Temperature, and of 

 Relative Humidity of the Atmosphere, at the hours of 6, 9, 12, 3, 

 6 and 9, from morning till night, based upon daily observations at 

 these hours through the years 1861 and 1862, at St. Louis, Mo. 



