412 
APPENDIX NO. XII. 
Xo. XII. 
Meteorological Abstracts. 
The temperatures iu the second column are means of the hourly 
readings corrected for errors of thermometers, and are expressed in 
degrees of Fahrenheit’s scale. The sign — is prefixed to tempera¬ 
tures below zero. 
In the fifth column the mean temperature of the surface-water has 
been noted; and after October 1, 1853, this column contains the 
mean reading of the barometer at temperatures recorded in the follow¬ 
ing column. 
The next columns contain the state of the weather, recorded three 
times a day: — at the hours 4, 12, and 20. The force of the wind is 
indicated by figures from 1 to 10, — the former expressing light airs, 
the latter a hurricane; the letter c stands for calm. The direction of 
the wind is given uucorrectcd for variation of compass. From June 1, 
1853, to September 11, 1853, the state of the weather is to be found 
in the abstract of the log-book. 
To indicate the condition of the atmosphere the following abbrevia¬ 
tions were used :—b for clear sky; o for sky entirely covered with 
clouds; f for fog, r for rain, and s for snow; bml for sky covered one- 
third with mist or clouds, and bm2 for the same covered two-thirds 
with mist or clouds.—E. K. K. 
