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Sect. IX.] 



MITEOROLOGY. 



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as it traverses them, but not otherwise appearing as lumi 



nous masses, particularly noticed. When arches or any 

 considerable well-defined cloud-like masses are formed, 

 mark on the chart their situation and extent amone the 

 stars at several noted epochs of time, particularizing the 

 brightest portions ; observe also tlie point of convergence 

 of stn^amers and the formation of the corona, the ceniral 

 point or focus of which should be projected on the chart 

 vnth all possible exactness, and the time of so doing exactly 

 taken, so as to determine by subsequent calculation its 

 altitude and azimuth. Any indication of the near vicinity 

 of auroral phenomena, or of their existence at a level 

 belov.^ that of ordinary clouds, should be most minutely 

 investigated at the moment, and carefully and circum- 



The connexion, if any, 



bet 



ween 



II 



stantially recorded. 



auroral masses and cirrous clouds should be traced 

 opportunity occur. Note also the meteors if remarkable 

 wdthin the auroral region. 



Ilalos, parhelia, mock suits, and other luminous phe- 

 nomena of the kind, should be noted, delineated 



Wit 



care if complicated, and their dimensions measured with a 

 sextant, or otherwise, by bringing the limb of the sun or 

 moon (noting which limb) in contact with the two edges 

 of the phenomenon in succession. Their colours also and 

 their order should be described. 



Light cirro-stratus 



cloud in the neighbourhood of the sun has been observed 

 to be bordered with three fringes of pink and green 



colours following the outline of the cloud. This rare and 



b...utiful phenomenon if seen should be most particularly 

 and carefully described. Perhaps in some climates it 

 may be of not unfrcquent occurrence. Unusual tints ob- 

 served in the sky should be noted, and should that ex- 





