12 



THE NATURE BOOK 



Cirrus clouds are of a fibrous or feathery 

 nature, and sometimes these feathers 

 stretch right across the sky, apparently 

 converging towards the horizon as a 



Natural History Museum. From the lie of 

 the clouds it will be noticed that the 

 direction of the wind in this elevated 

 region can be estimated. 



CIKKUS CLOUDS. 

 Photographed at South Kensington at 4.30 on an October afternoon. 



result of perspective. The illustration on 

 this page is a good typical example of 

 such clouds. In this picture the observer 

 is looking due west, and the sun is well 

 down towards the horizon. The photo- 

 graph was taken on October 23rd, 1906, 

 at 4.30 p.m., at South Kensington, and 

 the towers seen are a portion of the 



Sometimes cross currents invade these 

 regions, and the thin, fibrous-like clouds 

 are drawn out into fantastic shapes. 

 The photograph at the bottom o'f 

 ]iage 13 illustrates such a case, and is from 

 a photograph taken from the same spot, 

 only looking southward, on September 

 24th, 1906, at 3.45 p.m. Here we see 



