70 OF CLOUDS. CHAP. 2. 10. 



under the aforesaid cirrus, which now seemed 

 affected by the approach of the cumulus, and 

 rapidly took on the form of a sort of stellated 

 cirrocumulus ; the cumulus, at the same time, 

 increased in density, and approached more to the 

 nature of cumulostratus. I have several times 

 since seen this phaenomenon effected in the same 

 manner. On the 16th June, 1811, a large mass 

 of cumulostratus passing under long streaks of 

 cirrostratus, the latter gradually, as the former 

 approached, changed into cirrocumulus. For 

 particulars relative to the kind of weather, state 

 of meteorological instruments, &c. see Journal 

 for the above two days in Gent. Mag. for July, 

 1811. Analogy leads us to refer these phaeno- 

 mena to the operation of the different electricities 

 of the two clouds on each other. The effect of 

 large masses of cumulus on smaller ones in 

 their vicinity has been otherwise noticed. The 

 approximation of clouds towards each other is 

 always attended with some alteration of their 

 appearance. And clouds are always operating 

 on one another and altering each others' forms. 



