The persistence of clay aggregation was evaluated in the laboratory by aid drying clay soil (69% clay, 29% silt, and 2% sand) and combining aggregates of three sizes ( 2 cm, 2-5 cm, 5-8 cm) in a 60-30-10 percent mixture by weight to form experimental units of uniformly mixed material weighing approximately 73 kg. A total of 24 units were prepared and subjected to three treatments with eight replications. Treatments included a control, wetting drying without compaction, and wetting-drying with compaction. After applying treatments, the experimental units were broken down arid sieved to evaluate aggregate size distribution. Statistical analysis indicated a significant difference between the control and the other two treatments and no significant difference between compacted[ and non-compacted treatments which were wetted and dried. Conclusions resulting from the study were that (1) it appears that over a period of time, the fine material tends to combine with larger aggregates as the soil experiences wetting and drying cycles, and (2) com paction does not significantly affect aggregate size for montmorillonite clay soil which goes through wetting and drying cycles.