COMPOSITION OF THE ATMOSPHERE. 55 



Carbonic Acid. 



Place. 



CO, in 

 loo pts. 



Forests. 



CO, in 

 100 pts. 



Braemar 



•0346 



•0342 



■0344- 

 •0344 

 •0344 

 •0344 

 •0340 



Ballochbine Forest, near 

 Castletown 



•0340 

 •0325 

 ■0327 

 •0336 

 ■0337 

 •0343 



•0353 







Ditto, ditto 





Ditto, ditto 





Mar Forest, ditto 





Ditto, ditto 



Tiimnnfil "RriVlgP 



Ditto, ditto 



Mean 



Forest near Killikrankie 

 Pass 



Mean 



•0343 



■0337 







Carbonic Acid^close Places in Perth City. 



Name of Place. 



Time. 



Close, 148 South Street Oct. 10, 11 a.m. 



Over a conduit, Athole Crescent Oct. 12, 7.25 a.m. 



On North Inch, near the last Oct. 12, 8 a.m. 



Craigie Oct. 12, i p.m. 



Craigie Oct. 12, 3 p.m. 



Craigie Oct. 12, 10 p.m. 



Paul's Close, Newrow Oct.* 14, 8 a.m. 



Close, 44 Pomarium Oct. 17, 9 p.m. 



Close, 82 South Street ' Oct. 18, 11^ a.m. 



Close, 44 Pomarium ' Oct. 18, i2.2op.m, 



Mean 



Weaver's Shop, 56 Pomarium ' Oct. 17, 9.40 p.m. 



CO^in 

 100 pts, 



•0399 

 •0401 

 •0352 

 ■0324 

 •0332 

 •0573 

 •0430 

 •0508 

 •0464 

 ■0353 



•04136 

 •2674 



We must carefully study the numbers in the City of 

 Perth. The whole week was windy ; but stillthe amount 

 is higher than round the city at some distance. Although 

 there is much irregularity in the instance at Craigie^ above 

 the town the number is high. The analysis was repeated 

 with the same result : the reason is not clear ; chimneys 

 may suggest one. On Kinnoul Hill and Errol the amount 

 is lower than in any case^ although the latter was wet and 

 marshy. Such inquiries scarcely end. I must take the 

 amount in the town on a calm day. There is^ however^ 

 sufl&cient given to prove that, taking the oxygen and the 



