their Producilon, Suspefision, and Destrkction. 93 



admit intermediate and compound modifications, and to 

 impose names on such of them as are worthy of notice. 

 The simple modifications are thus named and dclintid : 



1. CiKRUS. Def, Nubcs cirrata, tenuissima, quce un- 

 diquc crescat. 



Parallel, flexuous, or diverging fibres, extensible in any 

 or in all directions. 



2. Cumulus. Def. Nubes cumulata, densa, sursum 

 crcscens. 



ConvTX or conical heaps, increasing upward from a ho- 

 rizontal base. 



3. Stratus. DeJ". Nubes strata, aqus modo expanja, 

 deorsum creseens. 



A widely extended, continuous, horizontal sheet, in- 

 creasing from below. 



This application of the Latin word strahis is a little 

 forced. But the substantive, stratum, did not agree in its 

 termination with the other two, and is besides already used 

 in a ditferent sense even on this subject, e. g. a stratum of 

 clouds ; yet it was desirable to keep the derivation from the 

 \T^,rb sterno, as its significations agree so well with the cir- 

 cumstances of this cloud. 



The intermediate modifications which require to be no- 

 ticed are ; 



4. Cirro-cumulus. Def. Nubeculae densiores subro 

 tundae et quasi in agmine appositae. 



Small, well defined roundish masses, in close horizontal 

 arrangement. 



3. CiRKO-STRATUS. Def Nubcs extenuata sub-eoncava 

 vel undulata. Nubeculae hujus modi apposita:. 



Horizontal or slightly inclined masses, attenuated towards 

 a part or the whole of their circumference, bent down- 

 ward, or undulated, separate, or in groups consisting of 

 small clouds having these characters. 



The compound modifications are : 



C. CuMULO-STRATus. Def Nubes densa, basim pla- 

 ram undi(jue supercrescens, vel cujus moles longinqua vi- 

 dctur partim plana partim cumulata. 



The cirro-stratus blended with the cumulus, and either 

 appearing intermixed with the heaps of the latter or su- 

 Jieradding a wide-spread structure to its base. 



7. CuMULO-ciKRO-sTRATus vcl NiMBus. Def Nubcs 

 vel nubiuin congeries phiviam cffundens. 



The rain cloud. A cloud or system of clouds from which 



pain is falling. It is a horizontal sheet, ;iJ>ovc which tlio 



G a ciriua 



