80 
MC ADIE. 
The International Nomenclature. 
Descriptions of the Clouds (modified from those in the 
Hildebrandsson-Koppen-Neumayer Atlas). 
1. Cirrus (Ci.). Isolated feathery clouds of fine fibrous texture , 
generally of a white color; frequently arranged in bands 
which spread like the meridians on a celestial globe over a 
part of the sky and converge in perspective towards one or 
two opposite points of the horizon. (In the formation of 
such bands Ci. S. and Ci. Cu. often take part.) 
2. Cirro-Stratus (Ci. S.). Fine whitish veil , sometimes 
quite diffuse, giving a whitish appearance to the sky, and 
called by many cirrus haze, and sometimes of more or less 
distinct structure, exhibiting tangled fibers. The veil often 
produces halos around the sun and moon. 
3. Cirro-Cumulus (Ci. Cu.). Fleecy cloud. Small white 
balls and wisps without shadows, or with very faint shadows, 
which are arranged in groups and often in rows. 
4. Alto-Cumulus (A. Cu.). Dense fleecy cloud. Larger 
whitish or grayish balls with shaded portions, grouped in flocks 
or rows, frequently so close together that their edges m,eet. The 
different balls are generally larger and more compact (pass¬ 
ing into S. Cu.) towards the center of the group and more 
delicate and wispy (passing into Ci. Cu.) on its edges. They 
are very frequently arranged in lines in one or two direc¬ 
tions. 
(The term cumulo-cirrus is given up as causing confu¬ 
sion.) 
5. Alto-Stratus (A. S.). Thick veil of a gray or bluish 
color, exhibiting in the vicinity of the sun and moon a 
brighter portion, and which, without causing halos, may 
produce coronse. This form shows gradual transitions to 
cirro-stratus, but, according to the measurements made at 
Upsala, has only half the altitude. 
(The term strato-cirrus is abandoned as giving rise to 
confusion.) 
