The nature of air masses during the monsoon season and the causes responsible for (1) small rainfall and (2) desert conditions over west Rajasthan have been discussed. It is shown that reduction in the quantity of dust suspended in the atmosphere can increase neither the depth of the moist layer nor the rainfall over the area as suggested by Brysonand co-workers (1964. 1967-); stable conditions between about 1. O and 2. O km are not considered as being due to subsidence which can ordinarily occur over the area only above about 3' O km.
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