208 Scientific Proceedings, Royal Dublin Socicty. 
If the results obtained by De Saussure and Boussingault, 
respectively, are added to the preceding, the following figures 
are obtained— 
Number of Curves trending— 
Period. ee Showing. 
Upwards. Downwards. 
June—July, . : : : 10 16 Decrease. 
July—August, : « , 9 16 Decrease. 
August—September, : ; 14 8 Increase. 
September—October, . ‘ 9 14 Decrease. 
October—November, : : 14 11 Increase. 
November—December, . ; 15 10 Increase. 
These additions therefore fortify the above conclusions. 
A comparison of the trend of the curves of atmospheric car- 
bonic anhydride, and of the carbonic anhydride in ground air is 
also of interest. For the latter we have taken v. Fodor’s figures. 
Period. | Trend oft ee Seal Teed hee 
January—February, . : ; P P 
February—March, . . . ? i 
March—April, . : : : Increase. Increase. 
April—May, . : i 5 Increase. Increase. 
May—June, : . . 9 Decrease. Increase. 
June—July, : 4 : Decrease. Increase. 
July—August, . ; : : Decrease. Decrease. 
August—September, . : 3 Increase. Decrease. 
September—October, . 2 : Decrease. Decrease. 
October—November, . ‘ i Increase. Decrease. 
November—December, : : Increase. Decrease. 
December—January, . : c Increase. Decrease. 
Thus the movements in the variations of the carbonic anhydride 
