42 
2. Length of column of air. 
10:06 A.M 5.50 
10:10 * 5.20 
10:35 “ 4.60 
10:42 “ 4.30 
To:51 “ 4.10 
Ti:nr ‘ 3.80 
11:40 “ 3.40 
T1:50 ‘ 3-20 
12:50 P.M. 1.60 
2225.5" 2.00 
3330 “ 1.70 
7:20 AM 1.20 
oo * 80 
4:00 P.M 78 
The total duration of the experiment was 30 hours and the 
final pressure attained was sufficient to compress a column of air 
from a length of 6.30 78 and the amount is indicated as 
‘o the square inc 
D. T. MacDoueat. 
NOTES, NEWS AND COMMENT. 
Discussions as follows have been given in the weekly botanical 
conventions at the Garden: A summer's work at Kew, by Pro- 
S M. U 
Cyclopedia of American per aek by Prolessor L. M. Under- 
wood; Marine flora of muda, by Dr. M. A. Howe; Some 
features of the vegetation ne the Great ee by Professor C. E. 
Bessey ; A new alga from Bermuda, by H. M. Richards; Results 
