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3U 



METEOROLOGV. 



[Sect. IX. 



approach and recess? Do any and what electrical phe- 

 nomena accompany them ? Does the water really ascend 

 along their axis, and to what height ? Is the water they 



discharge in "" bursting " fresh or salt ? Note its tem- 



perature. 



e 



every 



Showers of Dust or Ashes. — When they fell, preserv 

 specimens and examine them microscopically, whether 

 consisting of organized or mineral matter. Note 

 ckTumstance, especially the direction of the wind, and 

 whether an upper current differing in direction from the 

 lower, exist. Geographical situation of the ship espe- 

 cially to be exactly ascertained. Enquire for volcanic 

 eruptions within a thousand miles of the place of their 

 occurrence. 



Thunderstorms, Lightning, Firehalls, Sfc. — Note the 

 quarter of the horizon where distant lightning unaccom- 

 panied with thunder appears and the extent it embraces. 

 Especially notice any appearance of forked lightning 

 striking upimrds. In an actual thunderstorm espedally 

 attend to the quantity of rain or hail that falls — its inter- 

 mittences, and its correspondence or the contrary v/ith 

 great bursts of lightning near at hand. Notice the appa- 

 rent direction taken by the storm, with, or against the 

 wind. Attend to the remarkable reversal in the direction 

 of the wind winch often immedlatelv follows the cessation 

 of a thunderstorm. Violent thunder and lightning in the 

 immediate vicinity of the place of observation sometimes 



very rarely, take place without rain, or with very 

 little. In such cases notice every particular with the 

 utmost minuteness, and ascertain if possible whether the 

 storm has been elsewhere attended with rain. Fireballs 

 are st^.ted to have been occasionallv seen running along 



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