212 Scientific Proceedings, Royal Dublin Society. 
EKbermayer gives the following results of his own investigations 
in the Bavarian Highlands :— 
1883 Altitude Op um 10,000 
vols. air. 
Nove Gay Tele. il RE eee ee Satna ie aa mane 016 
as 2, ,, 4Zollhaus, : - - GOBim, : 3:27 
1884 
Aug. 24, Fallek bei Hirschbichel, . > LiB2ia, . ‘ 3°26 
», 21, Funtensee, . : 3 5 LA, , 2°93 
Sept. 19, Wendelstein . : 3 5 IS im,  < : 3°35 
a 17, Chiemsee, : ? : os Slim, - : 2°80 
Oct. 2, Hohenschwangau, 
Marienbriicke, ‘ > S$O0Him, 4 : 2°68 
Spiegel des Alpsees, 0 6 SabGils ‘ 3°79 
Auf einer Waldwiese, 5 SAOiM, 6 : 3°24 
General mean, . : 3°16 
The mean obtained by him for the Bavarian plains (560 m.) being 
3°20. In 1885 and 1886 Marcet and Landriset made simultaneous 
observations at Geneva, 90 to 100 feet above the lake (¢.e. about 
1300 feet above sea level), and on the summit of the Dole 
(5498 feet), thus giving a difference of altitude of nearly 4200 feet. 
Their results were as follows :— 
Malagny nearGeneva. Summit of the Dole. 
Aug. 31st, 1885 mean : Q 3°88 3 : 3°53 
Sos liste, gg as : : 4-06 : : 3°38 
Aug. 26th, 1886 __,, : ‘ 3°50 : ‘ 3°62 
pp Pally 5p iy : 3 3°76 Z é 3.75 
Generalmean . 5 8468 : . 3:754 
And their conclusions— 
(1) In fine clear weather on a mountain chain of a moderate 
Alpine altitude, and in the neighbouring valley or plain, the atmo- 
sphere holds the same proportion of carbonic anhydride. 
(2) When the summit of a mountain chain is in a cloud, the 
air in the cloud contains less carbonic anhydride than it would 
hold in clear weather—this result applying perhaps more fully 
when the mountain cloud is extensive in its area than when very 
low and circumscribed. A cloud on a mountain appears to inter- 
fere with diffusion from below—the main region the gas is derived 
from. This view is consistent with Russell’s experiments on air. 
