Poly vinylcaprolactam (PVCL) is completely soluble in water at temperatures below the lower consolute temperature (LCST) of ~32oC, above which a stable, non-sedimenting cloudy state is formed. Silica dispersions in PVCL solutions are stable below the LCST, but rapid reversible flocculation and sedimentation occurs on raising the temperature above the LCST. Adsorption of PVCL to silica dispersions, as measured by the classical depletion method, is massively increased above the LCST, rising steeply with polymer concentration. The large adsorption and associated flocculation (which appears as an adsorption from the depletion method) are both reversed on lowering the temperature below the LCST. PVCL is known to form aggregates above the LCST . A further study of PVCL in aqueous solution by GPC, DLS and MALLS over a range of temperatures across the LCST for two molecular weight PVCL preparations has been made. The results indicate some aggregation below the LCST, rapidly increasing with temperature as the phase boundary is crossed . Above and near the boundary, the aggregates are polydisperse, becoming monodisperse as the temperature is raised further. Aggregation reaches a maximum, falling off at the highest temperatures studied. For example, aggregates formed in a 3000ppm solution of a 70K PVCL preparation reach a maximum hydrodynamic diameter of 1500nm at 40oC. The loss of PVCL from solution due to adsorption/flocculation observed with silica suspensions above the LCST increases linearly with concentration with an approximately constant fraction of the added polymer remaining in the supernatant.