APPENDIX. 



Record of the Weather kept on board the Yacht "Vox," from July 2, 185?, to September 18, 

 1859; with Notes on the Specific Gravity of Sea Water, on the State of the Ice, Appear- 

 ance of Animals, etc. etc. ; on the Aurora Borealis and Atmospheric Phenomena. 



The state of the weather is indicated by the following letters (Beaufort's notation) : — 



b Blue sky. p Passing showers. 



c Clouds (detached). 7 Squally. 



d Drizzling rain. t Rain. 



/ Foggy. s Snow. 



g Gloomy. t Thunder. 



h Hail. u Ugly (threatening) appearance. 



/ Lightning. v Visibility, objects at a distance unusually visible. 



m Misty (hazy). i« Wet (dew). 



o Overcast. z Snow drift. 



A bar ( — ) or a dot (.) under any letter augments its signification. 



The sign ("), in the record of the state of the weather, indicates the same entry as that of the 

 hour immediately preceding. 



The position of the vessel is given in the preceding record. The specific gravity of sea water was 

 determined by Twaddel's hydrometer, that of distilled water being 1.000. The temperature of sea 

 water and atmospheric pressure have already been stated. 



The specific gravity of sea water, in the last column, is given in units of the fourth place of decimals, 

 as indicated by the heading of the table. 



For reasons stated by A. Mitchell, A. M., M. D., in the July number, 18G0, of the Edinburgh New 

 Philosophical Journal, it has not been deemed advisable to publish the observations for amount of 

 ozone in the atmosphere. It is evident that the amount of discoloration of the papers exposed depends, 

 in a great measure, on the air passed over, and, therefore, presents the combined effect of the quantity 

 of ozone and the strength of the wind. 



