above the rain bearing level. ‘Then we have two problemsg one, K. Fs (Continued) it is probably rather dry up there and it might not last long tire and the other ong is that it would have to down. One theory is, I am not a moteorologist and since I an GnHYNNs here <I had better be careful of what i say, there has bees sone theory proposed, by woem I am not quite sure right now, rgther that there was continual interchange cycles between, if assumption is correct {t is encased in a enall water droplet that is between 15 to [0 microns in size, it is as it rises p evaporated but at the sane time a concentration mass of tiis natter that it would be reintern encased in other water dropletad Whether that changes the sise distribution I am not in a position say. I certainly don't want to get into any argument about the RAPPs Bises. As far as I an concerned it ia the biggest questicn mark whole problem. I would like te take this opportunity to point cut, for BIS/NEIDe benefit of whatever value it is to those ef you who are inkerested in the theoretical approach, that there is a possibility of a very simple expirical approach which comes about beaause, least fros our observations and I think from athers, the cuet burden of the atroaphere is very similar in particle gise and spectrum to the particle sise distribution ef this debgis. There is the oprortunity of measuring atsostheric dust b before and after rainfall and also the particle sise spec ah at “witiiin the drops. It is my ispression, I know that at le