HOW TO KNOW THE CLOUDS 



By WILLIAM J. S. LOCKYER, MA, Ph.D., F.R.A S. 

 With Photographs by the Author 



IT 



COMING now to the clouds which in 

 the classification fall in the inter- 

 mediate layer, the highest of these 

 is the cirro-cumulus. These can easily be 

 identified, as they are composed of small 

 globular masses or white flakes without 

 shadows, or with very light shadows, and 

 they arrange themselves in groups, and 



very often in lines. Sometimes they ap- 

 pear like waves on the surface of water, 

 and occasionally two distinct systems are 

 observed, the regular striae apparently 

 crossing each other. This type of cloud is 

 perhaps better known as " mackerel sky," 

 as the flecks have a thin scaly appear- 

 ance, like unto scales of certain fish. 



CIKKO-CUMULUS CLOUDS. 

 Photographed at South Kensington, July 13, 1907, at 10.50 a.m. 



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