51. Cirrocumulus Predominating, Associated With a Small Quantity 

 of Cirrus, H^. 



In this picture the cirrociimiihis predommates but there is some 

 cirrus, especially in the lower right portion. At the middle of the 

 lower margin the transition from cirrus to cirrocumulus is evident. 

 The latter is evolved by a degeneration of a mass of cirrus or a sheet 

 of cirrostratus. The cloudlets are without definite shadows. (Photo 

 at Cheyenne, Wyo., by H. T. Floreen.) 



52. Cirrocumulus Predominating, Associated With a Mass of Cirrus, 



The individual cloudlets in this picture are without definite shadow^s 

 and are associated with tufted cirrus in the lower portion of the picture. 

 According to the new defuiition of cirrocumulus, its relationship to 

 cirrus or cirrostratus is absolutely necessary. Cirrocumulus clouds 

 may be associated with cirrus or cirrostratus in the other classifications 

 but in H^ the cirrocumulus predominates. (Photo on Alount Wilson, 

 Calif., by F. Ellermann.) 



88 



