Pe jab ma .. LERs Yes, and it gradually settled dom. They are able to detect that vy optical effects, gradual decrease in height of the main body of dust. GHIGOS t Xe this consistent with your picture? WEXLER: Yes, I think so because that went well up ebove the low portion of the stratosphere where it was effectively sealed off from Asotropia exchange for lower atmosphere. This is also born out by some ncisture measurements that have been made. There have been about three mcisture measurenents nade by a balloon going up 100,000 feet and it shews that in the stratosphere the atmos- phere is extremely well stratified vertically. That is, there are layers meist or rather moist air and dry air. extremely low rate of mixing. This indicates an On the other hand, al] the measure- ments that have been made indicate that the composition of the atmosphere, that is the permanent gases are extremely uniform. It sort of cives you an idea of the time acale of mixing. It ia somewhere inbetween probably days or weeks where moisture, precivitation, evaporation and things like that can remain stra~tified and the time required to do uniform mixing. In that same connection, are the samples obtained by rockets too small to be wh analysed? LIBeYs t don't know. WEXOLAR: They get samples cown to the order of a ecourle hmndred ec I guess. We don't know what the content is . oa PALES, + at DUE ARCHIVES