ae ime wre eo weLE os (ecntinued) mixing turtulences up there. | This i way bigher than we're concerned with for even IYY 4I¥3 cloud. The peint is, tliat we con't have direct evidence for diffusion rates in the stratosphere yet, and we could get evidence if we could get balloons up through tae cloud and track it for even a few days, as is stgested here. Tie purpese uf nentioning it wes eimply te get ideas from jou people as to whether it was practical or mot. So far, I think the only real objection which has heen raised is that there might be sone otherway of doing 1 more economically, because the idea of a large network of balleen: soundings 1a rather horrifying, in a way, until one compares it % the cost of Mying aircraft, «hich would have to be jet aircraft, ap to theve sans heights, which [ think would be equally great. The sanpling people will object to the fact that we are trying to teleneter the information back and are not making an atteapt te find out what the material ta lile. It ia, in principle, perfectly possible to recever samiles fron balloons; that is, to send sampling gear up on a balloon. Weights as mch as a ton have been carried hy General Hillis polyethylene balloons up to 90,000 feet. We'd like to go higher. “ea could, presumably, if you want te cut down on the weight to a few bundred poundas we could get up te a 100,900 feet with these big balloons. Therefore it does suggest that if we wanted to find out what sort of zaterial is in the stratosphere one could also use balloons in this case. First of all, getting eed DOE ARCHIVES