16 



MR. BIRTS ARRANGEMENT OF CLOUDS. 



On some occasions a variety may become so prevalent as to over- 

 spread a great portion or the whole of the atmosphere : to point this 

 out, I conceive the term stratus may be applied, as C. 1. Compactus 

 stratus. I have noticed nine varieties that in this manner form strata. 

 In the following table all the varieties and modifications hitherto 

 noticed are arranged in the manner above mentioned, and for the sake 

 of reference I have prefixed a letter to each variety and modification, 

 the Nebula being distinguished by the small Roman characters ; the 

 Crinis by the small italic letters, the Fibrus by the Roman capitals, and 

 the Stratus by the italic capitals. In order that this branch of meteoro- 

 logy may be distinguished from the others, I have suggested that the 

 term Nephology be used, which is derived from the word ncphos, a 

 cloud, and logos, a discourse. 



TABULAR VIEW OF THE NOMENCLATURE OF 

 NEPHOLOGY. 



k G. Sphaericus 



I ... ... 



m ... Cumulatus 

 n ... Serratus 

 o ... Tenuis 



p ... Sphaericus 



Hirtus 



V 



) 



Tertius. 



s C. Tenuis 



t 



v ... Sphaericus 



w ... ... 



Quartus. 

 x C. Tenuis 

 y ... Sphaericus 



Quintus. 

 z C. Fibratus 

 a' ... 



b' ... Sphaericus 



c' STRATUS. 



A F. Fasciformis 



B 



C C. 1 



D 



E... 

 F... 

 G ... 2 



i C. Tenuis 



y 

 Compactus 



... 7 

 Cumulatus 

 Serratus 

 Sphaericus 



