JOURNAL OF MICROSCOPICAL SCIENCE. 



PLATES XIII. AND XIV. 



Figures illustrating Mr. J. Glaisher's Paper on Snow 

 Crystals. 



Figs. 14 and 19 are not referred to in the paper : on these Mr. Glaisher 

 adds the following notes : — 



Fig. 14. — On February 8th, the mean reading of the barometer at the 

 height of 82 feet above the sea was 29*730 inches : the highest reading of 

 the thermometer during the day was 32°, the lowest was 27|°, and the 

 mean temperature for the whole day was 30°, being 8° below the average 

 of the same day. The temperature of the dew point was 29°. Snow was 

 falling the whole of the day, mth scarcely any intermission. 



Fig. 19. — On February nth, the mean reading of the barometer at the 

 height of 82 feet was 29 '880 inches : the highest reading of the ther- 

 mometer diiring the daj^ was 33i°, the lowest was 22°, and the mean for 

 the whole day was 25^°, being 135° below the average for the day. The 

 mean temperature of the dew point was 19^°. The sky was overcast till 

 noon, and snow was falling occasionally. 



