their Produ'cfionf Suspension, and Destritctiom 103 



The cirro-cumulus is frequent in summer, and is attend- 

 ant on warm and dry weather. It is also occasionally and 

 niore sparingly seen in the interv'als of showers, and ia 

 ■tt'inter*. iTmay either evaporate, or pass to the cirrus or 

 cirro-stratus. 



Of the Cirro-stratus. 



This cloud appears to result from the subsidence of the 

 fibres of the cirrus to a horizontal position, at the same time 

 that they approach towards each other laterally; The forni 

 and relative position, when seen in the distance, frequently 

 give the idea of shoals of lish. Yet in this, as in other in- 

 stances, the structure must be attended to rather th;ai tha 

 form, which varies much, presenting at other times the 

 appearance of parallel bars, interwoven streaks like the 

 grain of polished wood, &c. It i§ always thickest in the 

 itiiddle, or at one extremity, and extenuated towards the 

 .edge. The distinct appearance of a cirrus does not always 

 precede the production of this and the last modification. 



The cirro-stratus precedts wind and rain, the near or di- 

 stant approach of which may sometimes be estimated from 

 its greater or less abundance and permanence. It is almost 

 alwavs to be seen in the intervals of storms. Sometimes 

 this and the cirro-cumulus appear together in the sky, and 

 even alternate with each other in the same cloud, when the 

 difi'erent evolutions which ensue are a curious spectacle, and 

 a judgment may be formed of the weather likely to ensue 

 by observing which modiiication prevails at last. The cirro- 

 stratus is the modification which Inost frequently and com- 

 pletely exhibits the pha:uomena of the solar and lunar halo, 

 and (as supposed from a few observaiions) the parhelion and 

 paraselene also. Hence the reason of the prognostic for 

 tbul weather, commonly drawn from the appearance of 

 halo f. 



this 



* The foHr/.ving pas<;;\gc i? hfeautifully descriptive of the appearance 

 of this modificutioii by moonlij-,lit: 



For ytt above these v.-afte<ii clouds arc seen 

 ( 1 11 a rcmiater sky, ctill more icrcuc') 

 Others, detached in ranges through the air, 

 Spotless as snow, and countless as they're fair} 

 Scatter'd immensely wide from east to west. 

 The heauteous senihlance of a flock at rest. 

 These to the rai'tur'd inind aloud proclaim 

 Their mighty shtphtjd's everlasting nnmc. 



Dlooinji eld's Fcvmcr's Boy, Winttr* 



t The frequent appearance of halo in this cloud may be atn ibufed to 



iu f«sic$»ing great extent, at such times, with little perpendicular depth, 



O 4 tind 



